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Network Working Group A. Johnston, Ed.
Request for Comments: 5359 Avaya
BCP: 144 R. Sparks
Category: Best Current Practice Tekelec
C. Cunningham
S. Donovan
Cisco Systems
K. Summers
Sonus
October 2008
Session Initiation Protocol Service Examples
Status of This Memo
This document specifies an Internet Best Current Practices for the
Internet Community, and requests discussion and suggestions for
improvements. Distribution of this memo is unlimited.
Abstract
This document gives examples of Session Initiation Protocol (SIP)
services. This covers most features offered in so-called IP Centrex
offerings from local exchange carriers and PBX (Private Branch
Exchange) features. Most of the services shown in this document are
implemented in the SIP user agents, although some require the
assistance of a SIP proxy. Some require some extensions to SIP
including the REFER, SUBSCRIBE, and NOTIFY methods and the Replaces
and Join header fields. These features are not intended to be an
exhaustive set, but rather show implementations of common features
likely to be implemented on SIP IP telephones in a business
environment.
Johnston, et al. Best Current Practice [Page 1]
RFC 5359 SIP Service Examples October 2008 Table of Contents 1. Overview ........................................................3 1.1. Legend for Message Flows ...................................4 2. Service Examples ................................................6 2.1. Call Hold ..................................................6 2.2. Consultation Hold .........................................19 2.3. Music on Hold .............................................38 2.4. Transfer - Unattended .....................................50 2.5. Transfer - Attended .......................................58 2.6. Transfer - Instant Messaging ..............................71 2.7. Call Forwarding Unconditional .............................77 2.8. Call Forwarding - Busy ....................................84 2.9. Call Forwarding - No Answer ...............................92 2.10. 3-Way Conference - Third Party Is Added .................101 2.11. 3-Way Conference - Third Party Joins ....................107 2.12. Find-Me .................................................113 2.13. Call Management (Incoming Call Screening) ...............125 2.14. Call Management (Outgoing Call Screening) ...............132 2.15. Call Park ...............................................135 2.16. Call Pickup .............................................147 2.17. Automatic Redial ........................................154 2.18. Click to Dial ...........................................163 3. Security Considerations .......................................166 4. Acknowledgements ..............................................166 5. References ....................................................167 5.1. Normative References .....................................167 5.2. Informative References ...................................168 Johnston, et al. Best Current Practice [Page 2]
RFC 5359 SIP Service Examples October 2008 1. Overview This document provides example call flows detailing a SIP implementation of the following traditional telephony services: Call Hold 3-Way Conference Consultation Hold Find-Me Music on Hold Incoming Call Screening Unattended Transfer Outgoing Call Screening Attended Transfer Call Park Instant Messaging Transfer Call Pickup Unconditional Call Forwarding Automatic Redial Call Forwarding on Busy Click to Dial Call Forwarding on No Answer Note that the Single Line Extension call flow has been removed from this document and will be covered in a separate document. The call flows shown in this document were developed in the design of a SIP IP communications network. They represent an example set of so-called IP Centrex services or PBX services. It is the hope of the authors that this document will be useful for SIP implementers, designers, and protocol researchers alike and will help further the goal of a standard implementation of RFC 3261 [RFC3261] and some of its extensions. These flows represent carefully checked and working group reviewed scenarios of SIP service examples as a companion to the specifications. These call flows are based on the current version 2.0 of SIP in RFC 3261 [RFC3261] with Session Description Protocol (SDP) usage described in RFC 3264 [RFC3264]. Other RFCs also form part of the SIP standard and are used and referenced in these call flows. The SIP specification and the other referenced documents are definitive as far as protocol issues are concerned. Also, these flows do not represent the only way to implement these services -- other approaches such as 3pcc (Third Party Call Control) [RFC3725] or Back-to-Back User Agents (B2BUAs) can be used. This specification does not preclude these or other approaches for implementing such services. The peer-to-peer design and principles of these service examples are described in the Multiparty Framework document [FRAMEWORK]. Johnston, et al. Best Current Practice [Page 3]
RFC 5359 SIP Service Examples October 2008 These flows assume the functionality described in the SIP Call Flow Examples document [RFC3665], which explores basic SIP behavior. Some of the scenarios described herein make use of the SIP method extension REFER [RFC3515], the SIP header extension Replaces [RFC3891], and the SIP header extension Join [RFC3911]. The SIP Events document [RFC3265] describes the use of SUBSCRIBE and NOTIFY, while the SIP Dialog Event Package document [RFC4235] describes the dialog event package. Some examples make use of the GRUU (Globally Routable User Agent URI) extension [GRUU]. These flows were prepared assuming a network of proxies, registrars, and other SIP servers. The use of Secure SIP URIs (sips) is shown throughout this document, implying TLS transport on each hop with assumed certificate validation. However, other security approaches can be used. The use of Digest authentication is shown in some examples. The emphasis in these call flows is the SIP signaling exchange. As a result, only very simple SDP offer/answer exchanges are shown with audio media. These flows apply equally well for other media and multimedia sessions. For more advanced examples of SDP offer/answer exchanges, refer to [RFC4317]. Each call flow is presented with a textual description of the scenario, a message flow diagram showing the messages exchanged between separate network elements, and the detailed contents of each message shown in the diagram. For simplicity in reading and editing the document, there are a number of differences between some of the examples and actual SIP messages. For example, the HTTP Digest responses are not actual MD5 encodings. Call-IDs are often repeated, and CSeq counts often begin at 1. Header fields are usually shown in the same order. Usually only the minimum required header field set is shown. Also, message body content lengths are often not calculated, but instead shown as "..." where the actual octet count would be. 1.1. Legend for Message Flows Dashed lines (---) represent control messages that are mandatory to the call scenario. These control messages can be SIP signaling. Double dashed lines (===) represent media paths between network elements. Messages with parentheses around the name represent optional control messages. Johnston, et al. Best Current Practice [Page 4]
RFC 5359 SIP Service Examples October 2008 Messages are identified in the figures as F1, F2, etc. This references the message details in the table that follows the figure. Lines longer than 72 characters are handled using the <allOneLine> convention defined in Section 2.1 of RFC 4475 [RFC4475]. Comments in the message details are shown in the following form: /* Comments. */ Johnston, et al. Best Current Practice [Page 5]
RFC 5359 SIP Service Examples October 2008 2. Service Examples 2.1. Call Hold Alice Proxy Bob | INVITE F1 | | |--------------->| | | | INVITE F2 | |(100 Trying) F3 |------------->| |<---------------| | | |180 Ringing F4| | 180 Ringing F5 |<-------------| |<---------------| | | | 200 OK F6 | | 200 OK F7 |<-------------| |<---------------| | | ACK F8 | | |--------------->| ACK F9 | | |------------->| | Both way RTP Established | |<=============================>| | |INVITE(hold) F10 |INVITE(hold) F11|<-------------| |<---------------| | | 200 OK F12 | | |--------------->| 200 OK F13 | | |------------->| | | ACK F14 | | ACK F15 |<-------------| |<---------------| | | No RTP Sent! | | | INVITE F16 | | INVITE F17 |<-------------| |<---------------| | | 200 OK F18 | | |--------------->| 200 OK F19 | | |------------->| | | ACK F20 | | ACK F21 |<-------------| |<---------------| | | Both way RTP Established | |<=============================>| | BYE F22 | | |--------------->| BYE F23 | | |------------->| | | 200 OK F24 | | 200 OK F25 |<-------------| |<---------------| | Johnston, et al. Best Current Practice [Page 6]
RFC 5359 SIP Service Examples October 2008 In this scenario, Alice calls Bob, then Bob places the call on hold. Bob then takes the call off hold, then Alice hangs up the call. Note that hold is unidirectional in nature. However, a UA that places the other party on hold will generally also stop sending media, resulting in no media exchange between the UAs. Older UAs may set the connection address to 0.0.0.0 when initiating hold. However, this behavior has been deprecated in favor or using the a=inactive SDP attribute if no media is sent, or the a=sendonly attribute if media is still sent. Also note the use of the rendering feature tag defined in RFC 4235 [RFC4235] used in F10 and F11 to indicate that Bob's UA is no longer rendering media to Bob, i.e., that Bob has placed the call on hold. Message Details F1 INVITE Alice -> Proxy 1 INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 INVITE Proxy 1 -> Bob INVITE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 Via: SIP/2.0/TLS client.atlanta.example.com:5061 Johnston, et al. Best Current Practice [Page 7]
RFC 5359 SIP Service Examples October 2008 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F3 (100 Trying) Proxy 1 -> Alice SIP/2.0 100 Trying Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 F4 180 Ringing Bob -> Proxy 1 SIP/2.0 180 Ringing Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Johnston, et al. Best Current Practice [Page 8]
RFC 5359 SIP Service Examples October 2008 Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Content Length:0 F5 180 Ringing Proxy 1 -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Content Length: 0 F6 200 OK Bob -> Proxy 1 SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 Johnston, et al. Best Current Practice [Page 9]
RFC 5359 SIP Service Examples October 2008 F7 200 OK Proxy 1 -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F8 ACK Alice -> Proxy 1 ACK sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf92 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 1 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 F9 ACK Proxy 1 -> Bob ACK sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK837492.1 Via: SIP/2.0/TLS client.atlanta.example.com:5061 Johnston, et al. Best Current Practice [Page 10]
RFC 5359 SIP Service Examples October 2008 ;branch=z9hG4bK74bf92 ;received=192.0.2.103 Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 1 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 /* Bob places Alice on hold. Note that the version is incremented in the o= field of the SDP. */ F10 INVITE Bob -> Proxy 1 INVITE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com>;+sip.rendering="no" Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=sendonly F11 INVITE Proxy 1 -> Alice INVITE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 Via: SIP/2.0/TLS client.biloxi.example.com:5061 Johnston, et al. Best Current Practice [Page 11]
RFC 5359 SIP Service Examples October 2008 ;branch=z9hG4bKnashds7 ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com>;+sip.rendering="no" Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=sendonly /* Alice replies to hold. */ F12 200 OK Alice -> Proxy 1 SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... Johnston, et al. Best Current Practice [Page 12]
RFC 5359 SIP Service Examples October 2008 v=0 o=alice 2890844526 2890844527 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=recvonly F13 200 OK Proxy 1 -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844527 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=recvonly F14 ACK Bob -> Proxy 1 ACK sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds72 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 1 ACK Johnston, et al. Best Current Practice [Page 13]
RFC 5359 SIP Service Examples October 2008 Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 F15 ACK Proxy 1 -> Alice ACK sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds72 ;received=192.0.2.105 Max-Forwards: 69 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 1 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 /* Bob takes the call off hold. */ F16 INVITE Bob -> Proxy 1 INVITE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds73 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 2 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844529 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com Johnston, et al. Best Current Practice [Page 14]
RFC 5359 SIP Service Examples October 2008 t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F17 INVITE Proxy 1 -> Alice INVITE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK837493.1 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds73 ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 2 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844529 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F18 200 OK Alice -> Proxy 1 SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK837493.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds73 ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 2 INVITE Johnston, et al. Best Current Practice [Page 15]
RFC 5359 SIP Service Examples October 2008 Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844528 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F19 200 OK Proxy 1 -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds73 ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 2 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844528 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F20 ACK Bob -> Proxy 1 ACK sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds74 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 Johnston, et al. Best Current Practice [Page 16]
RFC 5359 SIP Service Examples October 2008 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 2 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 F21 ACK Proxy 1 -> Alice ACK sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK837494.1 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds74 ;received=192.0.2.105 Max-Forwards: 69 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 2 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 /* RTP Media stream re-established. Alice disconnects. */ F22 BYE Alice -> Proxy 1 BYE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf97 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F23 BYE Proxy 1 -> Bob BYE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK837497.1 Johnston, et al. Best Current Practice [Page 17]
RFC 5359 SIP Service Examples October 2008 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf97 ;received=192.0.2.103 Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F24 200 OK Bob -> Proxy 1 SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK837497.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf97 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F25 200 OK Proxy 1 -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf97 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 2 BYE Content-Length: 0 Johnston, et al. Best Current Practice [Page 18]
RFC 5359 SIP Service Examples October 2008 2.2. Consultation Hold Alice Proxy Bob Carol | | | | | INVITE F1 | | | |--------------->| INVITE F2 | | | |------------->| | |(100 Trying) F3 | | | |<---------------|180 Ringing F4| | | |<-------------| | | 180 Ringing F5 | | | |<---------------| 200 OK F6 | | | |<-------------| | | 200 OK F7 | | | |<---------------| | | | ACK F8 | | | |--------------->| ACK F9 | | | |------------->| | | Both way RTP Established | | |<=============================>| | | |INVITE(hold) F10 | |INVITE(hold) F11|<-------------| | |<---------------| | | | 200 OK F12 | | | |--------------->| 200 OK F13 | | | |------------->| | | | ACK F14 | | | |<-------------| | | ACK F15 | | | |<---------------| | | | No RTP Sent! | | | | INVITE F16 | | | |<-------------| | | | | INVITE F17 | | |--------------------------------->| | |(100 Trying) F18 | | |------------->| | | | | 180 Ringing F19 | | |<---------------------------------| | | 180 Ringing F20 | | |------------->| | | | | 200 OK F21 | | |<---------------------------------| | | 200 OK F22 | | | |------------->| | | | ACK F23 | | | |<-------------| | | | | ACK F24 | Johnston, et al. Best Current Practice [Page 19]
RFC 5359 SIP Service Examples October 2008 | |--------------------------------->| | | Both way RTP Established | | | |<=================>| | | BYE F25 | | | |<-------------| | | | | BYE F26 | | |--------------------------------->| | | | 200 OK F27 | | |<---------------------------------| | | 200 OK F28 | | | |------------->| | | | INVITE F29 | | | INVITE F30 |<-------------| | |<---------------| | | | 200 OK F31 | | | |--------------->| 200 OK F32 | | | |------------->| | | | ACK F33 | | | |<-------------| | | ACK F34 | | | |<---------------| | | | Both way RTP Established | | |<=============================>| | | BYE F35 | | | |--------------->| BYE F36 | | | |------------->| | | | 200 OK F37 | | | |<-------------| | | 200 OK F38 | | | |<---------------| | | | | | | In this scenario, Alice calls Bob. Bob places call on hold. Bob calls Carol. Bob then disconnects with Carol, then takes the call with Alice off hold. The call ends when Alice hangs up. Also note the use of the rendering feature tag defined in RFC 4235 [RFC4235] used in F10 to indicate that Bob's UA is no longer rendering media to Bob, i.e., that Bob has placed the call on hold. Message Details F1 INVITE Alice -> Proxy 1 INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 Johnston, et al. Best Current Practice [Page 20]
RFC 5359 SIP Service Examples October 2008 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 INVITE Proxy 1 -> Bob INVITE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 Johnston, et al. Best Current Practice [Page 21]
RFC 5359 SIP Service Examples October 2008 F3 (100 Trying) Proxy 1 -> Alice SIP/2.0 100 Trying Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 F4 180 Ringing Bob -> Proxy 1 SIP/2.0 180 Ringing Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Content Length:0 F5 180 Ringing Proxy 1 -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Content Length: 0 Johnston, et al. Best Current Practice [Page 22]
RFC 5359 SIP Service Examples October 2008 F6 200 OK Bob -> Proxy 1 SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F7 200 OK Proxy 1 -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... Johnston, et al. Best Current Practice [Page 23]
RFC 5359 SIP Service Examples October 2008 v=0 o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F8 ACK Alice -> Proxy 1 ACK sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf45 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 F9 ACK Proxy 1 -> Bob ACK sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK837494.1 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf45 ;received=192.0.2.103 Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 Johnston, et al. Best Current Practice [Page 24]
RFC 5359 SIP Service Examples October 2008 /* Bob places Alice on hold. */ F10 INVITE Bob -> Proxy 1 INVITE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com>;+sip.rendering="no" Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=sendonly F11 INVITE Proxy 1 -> Alice INVITE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK837497.1 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com>;+sip.rendering="no" Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... Johnston, et al. Best Current Practice [Page 25]
RFC 5359 SIP Service Examples October 2008 v=0 o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=sendonly F12 200 OK Alice -> Proxy 1 SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK837497.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844527 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=recvonly F13 200 OK Proxy 1 -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> From: Bob <sips:bob@biloxi.example.com>;tag=314159 Johnston, et al. Best Current Practice [Page 26]
RFC 5359 SIP Service Examples October 2008 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844527 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=recvonly F14 ACK Bob -> Proxy 1 ACK sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashdsg Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 F15 ACK Proxy 1 -> Alice ACK sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK8374.1 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashdsg ;received=192.0.2.105 Max-Forwards: 69 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Johnston, et al. Best Current Practice [Page 27]
RFC 5359 SIP Service Examples October 2008 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 F16 INVITE Bob -> Proxy 1 INVITE sips:carol@chicago.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds22 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com> Call-ID: 9876543210@biloxi.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844834 2890844834 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 50170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F17 INVITE Proxy 1 -> Carol INVITE sips:carol@client.chicago.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749a.1 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds22 ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com> Call-ID: 9876543210@biloxi.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Johnston, et al. Best Current Practice [Page 28]
RFC 5359 SIP Service Examples October 2008 Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844834 2890844834 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 50170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F18 (100 Trying) Proxy 1 -> Bob SIP/2.0 100 Trying Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds22 ;received=192.0.2.105 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com> Call-ID: 9876543210@biloxi.example.com CSeq: 1 INVITE Content-Length: 0 F19 180 Ringing Carol -> Proxy 1 SIP/2.0 180 Ringing Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749a.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds22 ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=456654 Call-ID: 9876543210@atlanta.example.com CSeq: 1 INVITE Contact: <sips:carol@client.chicago.example.com> Content Length:0 F20 180 Ringing Proxy 1 -> Bob SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds22 Johnston, et al. Best Current Practice [Page 29]
RFC 5359 SIP Service Examples October 2008 ;received=client.chicago.example.com Record-Route: <sips:ss1.example.com;lr> From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=456654 Call-ID: 9876543210@biloxi.example.com CSeq: 1 INVITE Contact: <sips:carol@client.chicago.example.com> Content Length: 0 F21 200 OK Carol -> Proxy 1 SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749a.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds22 ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=456654 Call-ID: 9876543210@biloxi.example.com CSeq: 1 INVITE Contact: <sips:carol@client.chicago.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=carol 2890844922 2890844922 IN IP4 client.chicago.example.com s= c=IN IP4 client.chicago.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F22 200 OK Proxy 1 -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds22 ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=456654 Johnston, et al. Best Current Practice [Page 30]
RFC 5359 SIP Service Examples October 2008 Call-ID: 9876543210@biloxi.example.com CSeq: 1 INVITE Contact: <sips:carol@client.chicago.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=carol 2890844922 2890844922 IN IP4 client.chicago.example.com s= c=IN IP4 client.chicago.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F23 ACK Bob -> Proxy 1 ACK sips:carol@client.chicago.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds24 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=456654 Call-ID: 9876543210@biloxi.example.com CSeq: 1 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 F24 ACK Proxy 1 -> Carol ACK sips:carol@client.chicago.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749b.1 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds24 ;received=192.0.2.105 Max-Forwards: 69 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=456654 Call-ID: 9876543210@biloxi.example.com CSeq: 1 ACK Johnston, et al. Best Current Practice [Page 31]
RFC 5359 SIP Service Examples October 2008 Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 F25 BYE Bob -> Proxy 1 BYE sips:carol@client.chicago.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7j Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=456654 Call-ID: 9876543210@biloxi.example.com CSeq: 2 BYE Content-Length: 0 F26 BYE Proxy 1 -> Carol BYE sips:carol@client.chicago.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749k.1 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7j ;received=192.0.2.105 Max-Forwards: 69 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=456654 Call-ID: 9876543210@biloxi.example.com CSeq: 2 BYE Content-Length: 0 F27 200 OK Carol -> Proxy 1 SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749k.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7j ;received=192.0.2.105 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=456654 Johnston, et al. Best Current Practice [Page 32]
RFC 5359 SIP Service Examples October 2008 Call-ID: 9876543210@biloxi.example.com CSeq: 2 BYE Content-Length: 0 F28 200 OK Proxy 1 -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7j ;received=192.0.2.105 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=456654 Call-ID: 9876543210@biloxi.example.com CSeq: 2 BYE Content-Length: 0 /* Bob takes the call off hold. */ F29 INVITE Bob -> Proxy 1 INVITE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7b Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 2 INVITE Contact: <sips:bob@client.biloxi.example.com> Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844529 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 Johnston, et al. Best Current Practice [Page 33]
RFC 5359 SIP Service Examples October 2008 F30 INVITE Proxy 1 -> Alice INVITE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749q.1 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7b ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 2 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844529 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F31 200 OK Alice -> Proxy 1 SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749q.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7b ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 2 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... Johnston, et al. Best Current Practice [Page 34]
RFC 5359 SIP Service Examples October 2008 v=0 o=alice 2890844526 2890844528 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F32 200 OK Proxy 1 -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7b ;received=192.0.2.105 Record-Route: <sips:ss1.example.com;lr> From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 2 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844528 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F33 ACK Bob -> Proxy 1 ACK sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7d7 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 2 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Johnston, et al. Best Current Practice [Page 35]
RFC 5359 SIP Service Examples October 2008 Content-Length: 0 F34 ACK Proxy 1 -> Alice ACK sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK8374.1 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7d7 ;received=192.0.2.105 Max-Forwards: 69 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 2 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 F35 BYE Alice -> Proxy 1 BYE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf10 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F36 BYE Proxy 1 -> Bob BYE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK8379.1 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf10 ;received=192.0.2.103 Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 Johnston, et al. Best Current Practice [Page 36]
RFC 5359 SIP Service Examples October 2008 F37 200 OK Bob -> Proxy 1 SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK8379.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf10 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F38 200 OK Proxy 1 -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf10 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 Johnston, et al. Best Current Practice [Page 37]
RFC 5359 SIP Service Examples October 2008 2.3. Music on Hold Alice Bob Music Server | | | | INVITE F1 | | |--------------->| | | 180 Ringing F2 | | |<---------------| | | 200 OK F3 | | |<---------------| | | ACK F4 | | |--------------->| | | RTP | | |<==============>| | | | | | Bob places Alice on hold | | | | | INVITE (hold) F5 | |<---------------| | | 200 OK F6 | | |--------------->| | | ACK F7 | | |<---------------| | | no RTP | | | | | | Bob initiates music on hold | | | | | | REFER Refer-To: A F8 | |------------->| | | 202 F9 | | |<-------------| | | NOTIFY F10 | | |<-------------| | | 200 F11 | | |------------->| | INVITE F12 Replaces: B | |<------------------------------| | 200 OK F13 | |------------------------------>| | ACK F14 | |<------------------------------| | RTP Music | |<==============================| | BYE F15 | | |--------------->| NOTIFY F17 | | 200 OK F16 |<-------------| |<---------------| 200 OK F18 | | |------------->| Johnston, et al. Best Current Practice [Page 38]
RFC 5359 SIP Service Examples October 2008 | | | | The music on hold is complete | | | | | Bob takes Alice off hold | | | | | INVITE Replaces: M F19 | |<---------------| | | 200 OK F20 | | |--------------->| | | ACK F21 | | |<---------------| | | RTP | | |<==============>| | | BYE F22 | |------------------------------>| | 200 OK F23 | |<------------------------------| In this flow, Bob places Alice on hold with music. This is performed by Bob sending a REFER to a Music Server that sends an INVITE with Replaces to Alice. The Music Server then sends RTP music to Alice. Bob picks the call up from hold by sending an INVITE with Replaces to Alice. Note the use of the rendering feature tag defined in RFC 4235 [RFC4235] used in F5 to indicate that Bob's UA is no longer rendering media to Bob, i.e., that Bob has placed the call on hold. Feature tags are also used in F12 with the automaton (defined in RFC 3840 [RFC3840]) and byeless feature tags (defined in RFC 4235 [RFC4235]) to describe the capabilities of the Music Server. Should Alice not wish to receive music on hold, her UA could refuse F12 and she will remain on hold with Bob, but in silence. Message Details F1 INVITE Alice -> Bob INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:a8342043f@atlanta.example.com;gr> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Johnston, et al. Best Current Practice [Page 39]
RFC 5359 SIP Service Examples October 2008 Supported: replaces, gruu Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 180 Ringing Bob -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Content-Length: 0 F3 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 Johnston, et al. Best Current Practice [Page 40]
RFC 5359 SIP Service Examples October 2008 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F4 ACK Alice -> Bob ACK sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfd Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 /* Bob places Alice on hold. */ F5 INVITE Bob -> Alice INVITE sips:a8342043f@atlanta.example.com;gr SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bK874bk To: Alice <sips:alice@atlanta.example.com>;tag=1234567 From: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 712 INVITE Contact: <sips:bob@client.biloxi.example.com>;+sip.rendering="no" Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=sendonly Johnston, et al. Best Current Practice [Page 41]
RFC 5359 SIP Service Examples October 2008 F6 200 OK Alice -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bK874bk ;received=192.0.2.105 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 From: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 712 INVITE Contact: <sips:a8342043f@atlanta.example.com;gr> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces, gruu Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844527 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=recvonly F7 ACK Bob -> Alice ACK sips:a8342043f@atlanta.example.com;gr SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKq874b To: Alice <sips:alice@atlanta.example.com>;tag=1234567 From: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 712 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 /* Bob REFERs Music Server to establish session with Alice which replaces the established session between Alice and Bob. */ F8 REFER Bob -> Music Server REFER sips:music@server.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds9 Johnston, et al. Best Current Practice [Page 42]
RFC 5359 SIP Service Examples October 2008 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=02134 To: Music Server <sips:music@server.example.com> Call-ID: 4802029847@biloxi.example.com CSeq: 1 REFER <allOneLine> Refer-To: <sips:a8342043f@atlanta.example.com;gr?Replaces= 12345600%40atlanta.example.com%3Bfrom-tag%3D23431 %3Bto-tag%3D1234567&Require=replaces> </allOneLine> Referred-By: <sips:bob@biloxi.example.com> Contact: <sips:bob@client.biloxi.example.com> Content-Length: 0 F9 202 Accepted Music Server -> Bob SIP/2.0 202 Accepted Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds9 ;received=192.0.2.105 From: Bob <sips:bob@biloxi.example.com>;tag=02134 To: Music Server <sips:music@server.example.com>;tag=56323 Call-ID: 4802029847@biloxi.example.com Contact: <sips:music@server.example.com> CSeq: 1 REFER Content-Length: 0 F10 NOTIFY Music Server -> Bob NOTIFY sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74bT6 To: Bob <sips:bob@biloxi.example.com>;tag=02134 Max-Forwards: 70 From: Music Server <sips:music@server.example.com>;tag=56323 Call-ID: 4802029847@biloxi.example.com CSeq: 1 NOTIFY Event: refer Subscription-State: active;expires=60 Contact: <sips:music@server.example.com> Content-Type: message/sipfrag Content-Length: ... SIP/2.0 100 Trying Johnston, et al. Best Current Practice [Page 43]
RFC 5359 SIP Service Examples October 2008 F11 200 OK Bob -> Music Server SIP/2.0 200 OK Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74bT6 ;received=192.0.2.103 To: Bob <sips:bob@biloxi.example.com>;tag=02134 From: Music Server <sips:music@server.example.com>;tag=56323 Call-ID: 4802029847@biloxi.example.com CSeq: 1 NOTIFY Content-Length: 0 /* Music Server places call to Alice to replace session between Alice and Bob. */ F12 INVITE Music Server -> Alice INVITE sips:a8342043f@atlanta.example.com;gr SIP/2.0 Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74rf Max-Forwards: 70 From: <sips:music@server.example.com>;tag=0111 To: <sips:a8342043f@atlanta.example.com;gr> Call-ID: a5-75-34-12-76@server.example.com CSeq: 1 INVITE Referred-By: <sips:bob@biloxi.example.com> Contact: <sips:music@server.example.com>;automaton ;+sip.byeless;+sip.rendering="no" Require: replaces Replaces: 12345600@atlanta.example.com ;from-tag=23431;to-tag=1234567 Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=MusicServer 2890844576 2890844576 IN IP4 server.example.com s= c=IN IP4 server.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=sendonly Johnston, et al. Best Current Practice [Page 44]
RFC 5359 SIP Service Examples October 2008 F13 200 OK Alice -> Music Server SIP/2.0 200 OK Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74rf ;received=192.0.2.103 From: <sips:music@server.example.com>;tag=0111 To: <sips:a8342043f@atlanta.example.com;gr>;tag=098594 Call-ID: a5-75-34-12-76@server.example.com CSeq: 1 INVITE Contact: <sips:a8342043f@atlanta.example.com;gr> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces, gruu Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=recvonly F14 ACK Music Server -> Alice ACK sips:a8342043f@atlanta.example.com;gr SIP/2.0 Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK7rfF Max-Forwards: 70 From: <sips:music@server.example.com>;tag=0111 To: <sips:a8342043f@atlanta.example.com;gr>;tag=098594 Call-ID: a5-75-34-12-76@server.example.com CSeq: 1 ACK Content-Length: 0 F15 BYE Alice -> Bob BYE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bKnashds7 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com Johnston, et al. Best Current Practice [Page 45]
RFC 5359 SIP Service Examples October 2008 CSeq: 2 BYE Content-Length: 0 F16 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.105 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 /* Music Server reports success back to Bob by returning a 200 OK response. Bob obtains the dialog identifiers from the headers included in the response. */ F17 NOTIFY Music Server -> Bob NOTIFY sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74bf9 To: Bob <sips:bob@biloxi.example.com>;tag=02134 Max-Forwards: 70 From: Music Server <sips:music@server.example.com>;tag=56323 Call-ID: 4802029847@biloxi.example.com CSeq: 2 NOTIFY Event: refer Subscription-State: terminated;reason=noresource Contact: <sips:music@server.example.com> Content-Type: message/sipfrag Content-Length: ... SIP/2.0 200 OK Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74rf ;received=192.0.2.103 From: <sips:music@server.example.com>;tag=0111 To: <sips:a8342043f@atlanta.example.com;gr>;tag=098594 Call-ID: a5-75-34-12-76@server.example.com CSeq: 1 INVITE Contact: <sips:a8342043f@atlanta.example.com;gr> Johnston, et al. Best Current Practice [Page 46]
RFC 5359 SIP Service Examples October 2008 F18 200 OK Bob -> Music Server SIP/2.0 200 OK Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 To: Bob <sips:bob@biloxi.example.com>;tag=02134 From: Music Server <sips:music@server.example.com>;tag=56323 Call-ID: 4802029847@biloxi.example.com CSeq: 2 NOTIFY Content-Length: 0 /* Alice is now parked at the Music Server. */ /* Bob picks up the call by sending an INVITE to Alice, who replaces the existing session with the Music Server. */ F19 INVITE Bob -> Alice INVITE sips:a8342043f@atlanta.example.com;gr SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bK74bf9 From: Bob <sips:bob@biloxi.example.com>;tag=4i323pr To: Alice <sips:a8342043f@atlanta.example.com;gr> Call-ID: uioewrjk2k2were CSeq: 42121 INVITE Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Replaces: a5-75-34-12-76@server.example.com ;to-tag=098594;from-tag=0111 Contact: <sips:bob@client.biloxi.example.com> Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844631 2890844631 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3458 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=sendrecv Johnston, et al. Best Current Practice [Page 47]
RFC 5359 SIP Service Examples October 2008 F20 200 OK Alice -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.105 From: Bob <sips:bob@biloxi.example.com>;tag=4i323pr To: Alice <sips:a8342043f@atlanta.example.com;gr>;tag=6654323 Call-ID: uioewrjk2k2were CSeq: 42121 INVITE Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Contact: <sips:alice@client.atlanta.example.com> Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844576 2890844576 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=sendrecv F21 200 ACK Bob -> Alice ACK sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKj974bf9 From: Bob <sips:bob@biloxi.example.com>;tag=4i323pr To: Alice <sips:a8342043f@atlanta.example.com;gr>;tag=6654323 Call-ID: uioewrjk2k2were CSeq: 42121 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces Content-Length: 0 F22 BYE Alice -> Music Server BYE sips:music@server.example.com SIP/2.0 Max-Forwards: 70 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74rf Johnston, et al. Best Current Practice [Page 48]
RFC 5359 SIP Service Examples October 2008 To: <sips:music@server.example.com>;tag=0111 From: <sips:a8342043f@atlanta.example.com;gr>;tag=098594 Call-ID: a5-75-34-12-76@server.example.com CSeq: 15 BYE Content-Length: 0 F23 200 OK Music Server -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74rf ;received=192.0.2.103 To: <sips:music@server.example.com>;tag=0111 From: <sips:a8342043f@atlanta.example.com;gr>;tag=098594 Call-ID: a5-75-34-12-76@server.example.com CSeq: 15 BYE Content-Length: 0 /* Normal media session between Alice and Bob is resumed. */ Johnston, et al. Best Current Practice [Page 49]
RFC 5359 SIP Service Examples October 2008 2.4. Transfer - Unattended Alice Bob Carol | INVITE F1 | | |<-------------------| | | 180 Ringing F2 | | |------------------->| | | 200 OK F3 | | |------------------->| | | ACK F4 | | |<-------------------| | | RTP | | |<==================>| | | | | | Alice performs unattended transfer | | | | | REFER Refer-To:C F5| | |------------------->| | | 202 Accepted F6 | | |<-------------------| | | NOTIFY F7 | | |<-------------------| | | 200 OK F8 | | |------------------->| | | BYE F9 | | |------------------->| | | 200 OK F10 | | |<-------------------| | | No RTP Session | INVITE Referred-By: A F11 | |------------------->| | | 180 Ringing F12 | | |<-------------------| | | 200 OK F13 | | |<-------------------| | | ACK F14 | | |------------------->| | | RTP | | |<==================>| | NOTIFY F15 | | |<-------------------| | | 200 OK F16 | | |------------------->| | | | | Johnston, et al. Best Current Practice [Page 50]
RFC 5359 SIP Service Examples October 2008 In this scenario, Bob calls Alice. Alice then transfers Bob to Carol, then Alice disconnects with Bob. Bob establishes the session to Carol then reports the success back to Alice in the NOTIFY in F15. If the transfer fails, Bob can send a new INVITE back to Alice to re- establish the session. Despite the BYE sent by Alice in F9, the dialog between Alice and Bob still exists until the subscription created by the REFER has terminated (either due to a NOTIFY containing a Subscription-State: terminated;reason=noresource header field, as in F15, or a 481 response to a NOTIFY). For more about call transfer, see the transfer document [TRANSFER]. Message Details F1 INVITE Bob -> Alice INVITE sips:alice@atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com> Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 180 Ringing Alice -> Bob SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=314159 Johnston, et al. Best Current Practice [Page 51]
RFC 5359 SIP Service Examples October 2008 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Content-Length: 0 F3 200 OK Alice -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F4 ACK Bob -> Alice ACK sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds2 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 1 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 /* Session is established between Alice and Bob. */ Johnston, et al. Best Current Practice [Page 52]
RFC 5359 SIP Service Examples October 2008 /* Alice performs unattended transfer of Bob to Carol. */ F5 REFER Alice -> Bob REFER sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds8 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 101 REFER Refer-To: <sips:carol@chicago.example.com> Referred-By: <alice@atlanta.example.com> Contact: <sips:alice@client.atlanta.example.com> Content-Length: 0 F6 202 Accepted Bob -> Alice SIP/2.0 202 Accepted Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds8 ;received=192.0.2.105 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com Contact: <sips:bob@client.biloxi.example.com> CSeq: 101 REFER Content-Length: 0 F7 NOTIFY Bob -> Alice NOTIFY sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds32 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 2 NOTIFY Event: refer Subscription-State: active;expires=60 Contact: <sips:bob@client.biloxi.example.com> Content-Type: message/sipfrag Content-Length: ... Johnston, et al. Best Current Practice [Page 53]
RFC 5359 SIP Service Examples October 2008 SIP/2.0 100 Trying F8 200 OK Alice -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds32 ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 2 NOTIFY Content-Length: 0 /* Alice now disconnects with Bob. */ F9 BYE Alice -> Bob BYE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds43 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 102 BYE Content-Length: 0 F10 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds43 ;received=192.0.2.105 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 102 BYE Content-Length: 0 /* Bob attempts the transfer to Carol. */ Johnston, et al. Best Current Practice [Page 54]
RFC 5359 SIP Service Examples October 2008 F11 INVITE Bob -> Carol INVITE sips:carol@chicago.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds1 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com> Call-ID: 7436222@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Referred-By: <alice@atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844539 2890844539 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3458 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F12 180 Ringing Carol -> Bob SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds1 ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=928287 Call-ID: 7436222@atlanta.example.com CSeq: 1 INVITE Contact: <sips:carol@client.chicago.example.com> Content-Length: 0 F13 200 OK Carol -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds1 ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=928287 Johnston, et al. Best Current Practice [Page 55]
RFC 5359 SIP Service Examples October 2008 Call-ID: 7436222@atlanta.example.com CSeq: 1 INVITE Contact: <sips:carol@client.chicago.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=carol 2890944542 2890844542 IN IP4 client.chicago.example.com s= c=IN IP4 client.chicago.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F14 ACK Bob -> Carol ACK sips:carol@client.chicago.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds9 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=928287 Call-ID: 7436222@atlanta.example.com CSeq: 1 ACK Content-Length: 0 /* Bob and Carol now have established a session. Bob reports success to Alice, which Alice probably ignores. */ F15 NOTIFY Bob -> Alice NOTIFY sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds67 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 3 NOTIFY Event: refer Subscription-State: terminated;reason=noresource Contact: <sips:bob@client.biloxi.example.com> Content-Type: message/sipfrag Johnston, et al. Best Current Practice [Page 56]
RFC 5359 SIP Service Examples October 2008 Content-Length: ... SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds1 ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=928287 Call-ID: 7436222@atlanta.example.com CSeq: 1 INVITE Contact: <sips:carol@client.chicago.example.com> Content-Type: application/sdp Content-Length: ... F16 200 OK Alice -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds6 ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=314159 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345601@atlanta.example.com CSeq: 3 NOTIFY Content-Length: 0 Johnston, et al. Best Current Practice [Page 57]
RFC 5359 SIP Service Examples October 2008 2.5. Transfer - Attended Alice Bob Carol | | | | INVITE F1 | | |--------------->| | | 180 Ringing F2 | | |<---------------| | | 200 OK F3 | | |<---------------| | | ACK F4 | | |--------------->| | | RTP | | |<==============>| | |INVITE (hold) F5| | |<---------------| | | 200 OK F6 | | |--------------->| | | ACK F7 | | |<---------------| | | No RTP | | | | INVITE F8 | | |------------->| | | 180 Ringing F9 | |<-------------| | | 200 OK F10 | | |<-------------| | | ACK F11 | | |------------->| | | RTP | | |<============>| | |INVITE (hold) F12 | |------------->| | | 200 OK F13 | | |<-------------| | | ACK F14 | | |------------->| | | No RTP | | REFER Refer-To: C F15 | |<---------------| | |202 Accepted F16| | |--------------->| | | NOTIFY F17 | | |--------------->| | | 200 OK F18 | | |<---------------| | | INVITE Replaces: B F19 | |------------------------------>| Johnston, et al. Best Current Practice [Page 58]
RFC 5359 SIP Service Examples October 2008 | 200 OK F20 | |<------------------------------| | ACK F21 | |------------------------------>| | RTP | |<=============================>| | | BYE F22 | | |<-------------| | | 200 OK F23 | | |------------->| | NOTIFY F24 | | |--------------->| | | 200 OK F25 | | |<---------------| | | BYE F26 | | |<---------------| | | 200 OK F27 | | |--------------->| | In this scenario, Alice calls Bob. Bob puts Alice on hold then calls Carol to announce transfer, then places Carol on hold. Bob transfers Alice to Carol, which replaces the session between Bob and Carol. Carol then disconnects session with Bob. Alice reports success of transfer to Bob, who then disconnects with Alice. In this example, the Replaces header field [RFC3891] is inserted into the Refer-To URI by Bob. Note that the Refer-To URI is the Contact URI returned by Carol in the 200 OK response F10. This ensures that only the correct instance of Carol is reached. The presence of the gr URI parameter in the Contact URI in message F10 indicates that the Contact URI is a GRUU [GRUU] and will be globally routable outside of the dialog. Without knowing the Contact URI is a gruu, Bob must be prepared, if the triggered INVITE had failed, to retry the REFER with a Refer-To URI of the URI used to reach Carol but with a Require: replaces header escaped in the Refer-To header field, as discussed in the transfer document [TRANSFER]. Message Details F1 INVITE Alice -> Bob INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com Johnston, et al. Best Current Practice [Page 59]
RFC 5359 SIP Service Examples October 2008 CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 180 Ringing Bob -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Content-Length: 0 F3 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... Johnston, et al. Best Current Practice [Page 60]
RFC 5359 SIP Service Examples October 2008 v=0 o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F4 ACK Alice -> Bob ACK sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 /* Alice and Bob have established a session. Bob puts Alice on hold. */ F5 INVITE Bob -> Alice INVITE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=23431 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1024 INVITE Contact: <sips:bob@client.biloxi.example.com>;+sip.rendering="no" Content-Type: application/sdp Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: ... v=0 o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com Johnston, et al. Best Current Practice [Page 61]
RFC 5359 SIP Service Examples October 2008 t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=sendonly F6 200 OK Alice -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=23431 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1024 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844527 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=recvonly F7 ACK Bob -> Alice ACK sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds3 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=23431 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1024 ACK Content-Length: 0 /* Bob calls Carol. */ Johnston, et al. Best Current Practice [Page 62]
RFC 5359 SIP Service Examples October 2008 F8 INVITE Bob -> Carol INVITE sips:carol@chicago.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnash Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com> Call-ID: sdjfdjfskdf@biloxi.example.com CSeq: 42 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 28908445834 2890844834 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3458 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F9 180 Ringing Carol -> Bob SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnash ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=5f35a3 Call-ID: sdjfdjfskdf@biloxi.example.com CSeq: 42 INVITE Contact: <sips:39itp34klkd@chicago.example.com> Content-Length: 0 F10 200 OK Carol -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnash ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=5f35a3 Call-ID: sdjfdjfskdf@biloxi.example.com Johnston, et al. Best Current Practice [Page 63]
RFC 5359 SIP Service Examples October 2008 CSeq: 42 INVITE Contact: <sips:39itp34klkd@chicago.example.com;gr> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces, gruu Content-Type: application/sdp Content-Length: ... v=0 o=carol 2890844922 2890844922 IN IP4 client.chicago.example.com s= c=IN IP4 client.chicago.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F11 ACK Bob -> Carol ACK sips:39itp34klkd@chicago.example.com;gr SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashd5 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=5f35a3 Call-ID: sdjfdjfskdf@biloxi.example.com CSeq: 42 ACK Content-Length: 0 /* Bob puts Carol on hold. */ F12 INVITE Bob -> Carol INVITE sips:39itp34klkd@chicago.example.com;gr SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds0 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=5f35a3 Call-ID: sdjfdjfskdf@biloxi.example.com CSeq: 43 INVITE Contact: <sips:bob@client.biloxi.example.com>;+sip.rendering="no" Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... Johnston, et al. Best Current Practice [Page 64]
RFC 5359 SIP Service Examples October 2008 v=0 o=bob 289084834 2890844835 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3458 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=sendonly F13 200 OK Carol -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds0 ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=5f35a3 Call-ID: sdjfdjfskdf@biloxi.example.com CSeq: 43 INVITE Contact: <sips:39itp34klkd@chicago.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces, gruu Content-Type: application/sdp Content-Length: ... v=0 o=carol 2890844922 2890844923 IN IP4 client.chicago.example.com s= c=IN IP4 client.chicago.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=recvonly F14 ACK Bob -> Carol ACK sips:39itp34klkd@chicago.example.com;gr SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnash334 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=5f35a3 Call-ID: sdjfdjfskdf@biloxi.example.com Johnston, et al. Best Current Practice [Page 65]
RFC 5359 SIP Service Examples October 2008 CSeq: 43 ACK Content-Length: 0 /* Bob transfers Alice to Carol. */ F15 REFER Bob -> Alice REFER sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds2g Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=23431 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1025 REFER <allOneLine> Refer-To: <sips:39itp34klkd@chicago.example.com?Replaces= sdjfdjfskdf%40biloxi.example.com%3Bto-tag%3D5f35a3 %3Bfrom-tag%3D8675309&Require=replaces> </allOneLine> Referred-By: <sips:bob@biloxi.example.com> Contact: <sips:bob@client.biloxi.example.com> Content-Length: 0 F16 202 Accepted Alice -> Bob SIP/2.0 202 Accepted Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds2g ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=23431 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com Contact: <sips:alice@client.atlanta.example.com> CSeq: 1025 REFER Content-Length: 0 F17 NOTIFY Alice -> Bob NOTIFY sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfK Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Johnston, et al. Best Current Practice [Page 66]
RFC 5359 SIP Service Examples October 2008 Call-ID: 12345600@atlanta.example.com CSeq: 2 NOTIFY Contact: <sips:alice@client.atlanta.example.com> Event: refer Subscription-State: active;expires=60 Content-Type: message/sipfrag Content-Length: ... SIP/2.0 100 Trying F18 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfK ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 2 NOTIFY Content-Length: 0 /* Alice establishes session with Carol, which replaces the session between Bob and Carol. */ F19 INVITE Alice -> Carol INVITE sips:39itp34klkd@chicago.example.com;gr SIP/2.0 Via: SIP/2.0/TLS chicago.example.com:5061 ;branch=z9hG4bKadfe4ko To: Carol <sips:39itp34klkd@chicago.example.com> Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=3461 Call-ID: 9435674543@atlanta.example.com CSeq: 1 INVITE Require: replaces Referred-By: <sips:bob@biloxi.example.com> Replaces: sdjfdjfskdf@biloxi.example.com ;to-tag=5f35a3;from-tag=8675309 Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... Johnston, et al. Best Current Practice [Page 67]
RFC 5359 SIP Service Examples October 2008 v=0 o=alice 2890844989 2890844989 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 3458 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F20 200 OK Carol -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS chicago.example.com:5061 ;branch=z9hG4bKadfe4ko ;received=192.0.2.103 To: Carol <sips:39itp34klkd@chicago.example.com>;tag=ff3a From: Alice <sips:alice@atlanta.example.com>;tag=3461 Call-ID: 9435674543@atlanta.example.com CSeq: 1 INVITE Contact: <sips:39itp34klkd@chicago.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces, gruu Content-Type: application/sdp Content-Length: ... v=0 o=carol 2890844221 2890844221 IN IP4 client.chicago.example.com s= c=IN IP4 client.chicago.example.com t=0 0 m=audio 49172 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F21 ACK Alice -> Carol ACK sips:39itp34klkd@chicago.example.com;gr SIP/2.0 Via: SIP/2.0/TLS chicago.example.com:5061 ;branch=z9hG4bKadfe4kU3 To: Carol <sips:39itp34klkd@chicago.example.com>;tag=ff3a Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=3461 Call-ID: 9435674543@atlanta.example.com CSeq: 1 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Johnston, et al. Best Current Practice [Page 68]
RFC 5359 SIP Service Examples October 2008 Supported: replaces Content-Length: 0 /* Carol then disconnects from Bob. */ F22 BYE Carol -> Bob BYE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfE To: Bob <sips:bob@biloxi.example.com>;tag=8675309 Max-Forwards: 70 From: Carol <sips:carol@chicago.example.com>;tag=5f35a3 Call-ID: sdjfdjfskdf@biloxi.example.com CSeq: 1 BYE Content-Length: 0 F23 200 OK Bob -> Carol SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfE ;received=192.0.2.123 To: Bob <sips:bob@biloxi.example.com>;tag=8675309 From: Carol <sips:carol@chicago.example.com>;tag=5f35a3 Call-ID: sdjfdjfskdf@biloxi.example.com CSeq: 1 BYE Content-Length: 0 /* Alice tells Bob that the call has been successfully transferred. */ F24 NOTIFY Alice -> Bob NOTIFY sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf2N Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 3 NOTIFY Event: refer Subscription-State: terminated;reason=noresource Johnston, et al. Best Current Practice [Page 69]
RFC 5359 SIP Service Examples October 2008 Contact: <sips:alice@client.atlanta.example.com> Content-Type: message/sipfrag Content-Length: ... SIP/2.0 200 OK Via: SIP/2.0/TLS chicago.example.com:5061 ;branch=z9hG4bKadfe4ko ;received=192.0.2.103 To: Carol <sips:39itp34klkd@chicago.example.com>;tag=ff3a From: Alice <sips:alice@atlanta.example.com>;tag=3461 Call-ID: 9435674543@atlanta.example.com CSeq: 1 INVITE Contact: <sips:39itp34klkd@chicago.example.com> F25 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 3 NOTIFY Content-Length: 0 /* Bob disconnects with Alice. */ F26 BYE Bob -> Alice BYE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7P Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=23431 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1026 BYE Content-Length: 0 F27 200 OK Alice -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7P Johnston, et al. Best Current Practice [Page 70]
RFC 5359 SIP Service Examples October 2008 ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=23431 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1026 BYE Content-Length: 0 2.6. Transfer - Instant Messaging Alice Bob Carol | | | | INVITE F1 | | |------------->| | | 180 Ringing F2 | |<-------------| | | 200 OK F3 | | |<-------------| | | ACK F4 | | |------------->| | | Both way RTP Established | |<============>| | | | MESSAGE F5 | | |------------------>| | | 200 OK F6 | | |<------------------| | | | | INVITE Replaces:A-B F7 | |<---------------------------------| | 200 OK F8 | |--------------------------------->| | ACK F9 | |<---------------------------------| | Both way RTP Established | |<================================>| | BYE F10 | | |------------->| | | 200 OK F11 | | |<-------------| | | | In this scenario, Alice and Bob establish a session between them. Bob wants Carol to take the call and so sends an Instant Message (IM) to Carol containing Alice's URI and an embedded Replaces header field. If Carol clicks on the URI, Carol's SIP UA sends an INVITE to Alice, which replaces the session with Bob. Johnston, et al. Best Current Practice [Page 71]
RFC 5359 SIP Service Examples October 2008 This scenario shows the use of the SIP MESSAGE [RFC3428] method to pass the URI. However, another IM protocol or other method could have been used to pass the URI from Bob to Carol. Message Details F1 INVITE Alice -> Bob INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:a8342043f@atlanta.example.com;gr> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces, gruu Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 180 Ringing Bob -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=3145678 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Content-Length: 0 Johnston, et al. Best Current Practice [Page 72]
RFC 5359 SIP Service Examples October 2008 F3 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=3145678 Call-ID: 12345600@atlanta.example.com Contact: <sips:bob@client.biloxi.example.com> CSeq: 1 INVITE Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F4 ACK Alice -> Bob ACK sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74r Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=3145678 Call-ID: 12345600@atlanta.example.com Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces CSeq: 1 ACK Content-Length: 0 /* Bob IMs Carol. */ F5 MESSAGE Bob -> Carol MESSAGE sips:carol@chicago.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnash Max-Forwards: 70 Johnston, et al. Best Current Practice [Page 73]
RFC 5359 SIP Service Examples October 2008 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com> Call-ID: sdjfdjfskdf@biloxi.example.com CSeq: 42 MESSAGE Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE Supported: replaces Content-Type: text/html Content-Length: ... <HTML>Do you want to take this call from <allOneLine> <A HREF="sips:a8342043f@atlanta.example.com;gr?Replaces= 12345600@atlanta.example.com%3Bto-tag%3D3145678 %3Bfrom-tag%3D1234567&Require=replaces"> Alice</A>? </allOneLine> </HTML> F6 200 OK Carol -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnash ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=5f35a3 Call-ID: sdjfdjfskdf@biloxi.example.com CSeq: 42 MESSAGE Contact: <sips:carol@client.chicago.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE Supported: replaces Content-Length: 0 /* Carol takes the call from Bob. */ F7 INVITE Carol -> Alice INVITE sips:a8342043f@atlanta.example.com;gr SIP/2.0 Via: SIP/2.0/TLS pc.biloxi.example.com:5061 ;branch=z9hG4bK74HH Max-Forwards: 70 From: Carol <sips:carol@chicago.example.com>;tag=8675310 To: Alice <sips:a8342043f@atlanta.example.com;gr> Call-ID: 563456212@b2.chicago.example.com CSeq: 1 INVITE Require: replaces Johnston, et al. Best Current Practice [Page 74]
RFC 5359 SIP Service Examples October 2008 Replaces: 12345600@atlanta.example.com ;to-tag=3145678;from-tag=1234567 Contact: <sips:carol@client.chicago.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=carol 2890843122 2890843122 IN IP4 client.chicago.example.com s= c=IN IP4 client.chicago.example.com t=0 0 m=audio 5342 RTP/AVP 0 a=rtpmap:0 PCMU/8000 /* Alice matches the dialog information in the Replaces header and accepts the INVITE. */ F8 200 OK Alice -> Carol SIP/2.0 200 OK Via: SIP/2.0/TLS pc.biloxi.example.com:5061 ;branch=z9hG4bK74HH ;received=192.0.2.114 From: Carol <sips:carol@chicago.example.com>;tag=8675310 To: Alice <sips:a8342043f@atlanta.example.com;gr>;tag=131256 Call-ID: 563456212@b2.chicago.example.com CSeq: 1 INVITE Contact: <sips:a8342043f@atlanta.example.com;gr> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces, gruu Content-Type: application/sdp Content-Length: ... v=0 o=alice 289084543 289084543 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49172 RTP/AVP 0 a=rtpmap:0 PCMU/8000 Johnston, et al. Best Current Practice [Page 75]
RFC 5359 SIP Service Examples October 2008 F9 ACK Carol -> Alice ACK sips:a8342043f@atlanta.example.com;gr SIP/2.0 Via: SIP/2.0/TLS b2.biloxi.example.com:5061 ;branch=z9hG4bK7435 Max-Forwards: 70 From: Carol <sips:carol@chicago.example.com>;tag=8675310 To: Alice <sips:a8342043f@atlanta.example.com;gr>;tag=131256 Call-ID: 563456212@b2.chicago.example.com CSeq: 1 ACK Content-Length: 0 /* RTP streams are established between Alice and Carol. Alice hangs up with Bob due to the Replaces header field. */ F10 BYE Alice -> Bob BYE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=3145678 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F11 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=3145678 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 Johnston, et al. Best Current Practice [Page 76]
RFC 5359 SIP Service Examples October 2008 2.7. Call Forwarding Unconditional Alice Proxy Gateway | | | | INVITE F1 | | |--------------->| | |(100 Trying) F2 | | |<---------------| | | (181 Call Is Being Forwarded) F3 |<---------------| INVITE F4 | | |------------->| | |180 Ringing F5| | 180 Ringing F6 |<-------------| |<---------------| 200 OK F7 | | 200 OK F8 |<-------------| |<---------------| | | ACK F9 | | |--------------->| ACK F10 | | |------------->| | Both way RTP Established | |<=============================>| | BYE F11 | | |--------------->| BYE F12 | | |------------->| | | 200 OK F13 | | 200 OK F14 |<-------------| |<---------------| | | | | Bob wants all calls forwarded to the Public Switched Telephone Network (PSTN) (which is just another URI to the proxy server). Alice calls Bob. The proxy server rewrites the Request URI, and forwards the INVITE to a Gateway. Details of messaging behind the Gateway are not shown. Note that the 181 Call is Being Forwarded response is shown as sent by the proxy. Strictly speaking, the proxy is behaving as a user agent in this case as a proxy cannot generate non-100 provisional responses. Note also that forwarding could be accomplished using a redirect (302 Moved Temporarily response). Johnston, et al. Best Current Practice [Page 77]
RFC 5359 SIP Service Examples October 2008 Message Details F1 INVITE Alice -> Proxy INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 (100 Trying) Proxy -> Alice SIP/2.0 100 Trying Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 F3 (181 Call is Being Forwarded) Proxy -> Alice SIP/2.0 181 Call is Being Forwarded Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=9214d Johnston, et al. Best Current Practice [Page 78]
RFC 5359 SIP Service Examples October 2008 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 /* Proxy forwards call by rewriting Request-URI. */ F4 INVITE Proxy -> Gateway INVITE sips:+19727293660@gw1.example.com;user=phone SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F5 180 Ringing Gateway -> Proxy SIP/2.0 180 Ringing Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com Johnston, et al. Best Current Practice [Page 79]
RFC 5359 SIP Service Examples October 2008 CSeq: 1 INVITE Contact: <sips:+19727293660@gw1.example.com;user=phone> Content Length:0 F6 180 Ringing Proxy -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:+19727293660@gw1.example.com;user=phone> Content Length: 0 F7 200 OK Gateway -> Proxy SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:+19727293660@gw1.example.com;user=phone> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=GATEWAY1 2890844527 2890844527 IN IP4 gatewayone.example.com s= c=IN IP4 gatewayone.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 Johnston, et al. Best Current Practice [Page 80]
RFC 5359 SIP Service Examples October 2008 F8 200 OK Proxy -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:+19727293660@gw1.example.com;user=phone> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=GATEWAY1 2890844527 2890844527 IN IP4 gatewayone.example.com s= c=IN IP4 gatewayone.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F9 ACK Alice -> Proxy ACK sips:+19727293660@gw1.example.com;user=phone SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf31 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 F10 ACK Proxy -> Gateway ACK sips:+19727293660@gw1.example.com;user=phone SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749ws.1 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf31 ;received=192.0.2.103 Max-Forwards: 69 Johnston, et al. Best Current Practice [Page 81]
RFC 5359 SIP Service Examples October 2008 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 F11 BYE Alice -> Proxy BYE sips:+19727293660@gw1.example.com;user=phone SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfJe Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F12 BYE Proxy -> Gateway BYE sips:+19727293660@gw1.example.com;user=phone SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749G1 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfJe ;received=192.0.2.103 Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F13 200 OK Gateway -> Proxy SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749G1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfJe ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Johnston, et al. Best Current Practice [Page 82]
RFC 5359 SIP Service Examples October 2008 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F14 200 OK Proxy -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfJe ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 Johnston, et al. Best Current Practice [Page 83]
RFC 5359 SIP Service Examples October 2008 2.8. Call Forwarding - Busy Alice Proxy User B1 User B2 | | | | | INVITE F1 | | | |--------------->| INVITE F2 | | | |------------->| | |(100 Trying) F3 | | | |<---------------| 486 Busy F4 | | | |<-------------| | | | ACK F5 | | | |------------->| | |(181 Call is Being Forwarded) F6 | |<---------------| | INVITE F7 | | |--------------------------------->| | | | 180 Ringing F8 | | |<---------------------------------| | 180 Ringing F9 | | | |<---------------| | 200 OK F10 | | |<---------------------------------| | 200 OK F11 | | | |<---------------| | | | ACK F12 | | | |--------------->| | ACK F13 | | |--------------------------------->| | Both way RTP Established | |<=================================================>| | BYE F14 | | | |--------------->| | BYE F15 | | |--------------------------------->| | | | 200 OK F16 | | 200 OK F17 |<---------------------------------| |<---------------| | | | | | | Bob wants calls to B1 forwarded to B2 if B1 is busy (this information is known to the proxy). Alice calls B1, B1 is busy, the proxy server places call to B2. Message Details F1 INVITE Alice -> Proxy INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 Johnston, et al. Best Current Practice [Page 84]
RFC 5359 SIP Service Examples October 2008 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 INVITE Proxy -> B1 INVITE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 Johnston, et al. Best Current Practice [Page 85]
RFC 5359 SIP Service Examples October 2008 F3 (100 Trying) Proxy -> Alice SIP/2.0 100 Trying Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 F4 486 Busy Here B1 -> Proxy SIP/2.0 486 Busy Here Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 F5 ACK Proxy -> B1 ACK sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 F6 (181 Call is Being Forwarded) Proxy -> Alice SIP/2.0 181 Call is Being Forwarded Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Johnston, et al. Best Current Practice [Page 86]
RFC 5359 SIP Service Examples October 2008 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=9214d Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 /* The proxy now forwards the call to B2. */ F7 INVITE Proxy -> B2 INVITE sips:bob@client2.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.2 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F8 180 Ringing B2 -> Proxy SIP/2.0 180 Ringing Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.2 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 Johnston, et al. Best Current Practice [Page 87]
RFC 5359 SIP Service Examples October 2008 To: Bob <sips:bob@biloxi.example.com>;tag=7654321 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client2.biloxi.example.com> Content-Length: 0 F9 180 Ringing Proxy -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7654321 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client2.biloxi.example.com> Content-Length: 0 F10 200 OK B2 -> Proxy SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.2 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7654321 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client2.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844527 IN IP4 client2.biloxi.example.com s= c=IN IP4 client2.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 Johnston, et al. Best Current Practice [Page 88]
RFC 5359 SIP Service Examples October 2008 F11 200 OK Proxy -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7654321 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client2.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844527 IN IP4 client2.biloxi.example.com s= c=IN IP4 client2.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F12 ACK Alice -> Proxy ACK sips:bob@client2.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfX Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7654321 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 F13 ACK Proxy -> B2 ACK sips:bob@client2.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83731 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfX ;received=192.0.2.103 Max-Forwards: 69 Johnston, et al. Best Current Practice [Page 89]
RFC 5359 SIP Service Examples October 2008 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7654321 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 /* RTP streams are established between Alice and B2. */ /* Alice eventually hangs up with User B2. */ F14 BYE Alice -> Proxy BYE sips:bob@client2.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bW4 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7654321 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F15 BYE Proxy -> B2 BYE sips:bob@client2.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK837493 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bW4 ;received=192.0.2.103 Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7654321 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F16 200 OK B2 -> Proxy SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK837493 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 Johnston, et al. Best Current Practice [Page 90]
RFC 5359 SIP Service Examples October 2008 ;branch=z9hG4bK74bW4 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7654321 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F17 200 OK Proxy -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bW4 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7654321 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 Johnston, et al. Best Current Practice [Page 91]
RFC 5359 SIP Service Examples October 2008 2.9. Call Forwarding - No Answer Alice Proxy User B1 User B2 | | | | | INVITE F1 | | | |--------------->| INVITE F2 | | |(100 Trying) F3 |------------->| | |<---------------|180 Ringing F4| | | 180 Ringing F5 |<-------------| | |<---------------| | | | Request Timeout | | | | | | | CANCEL F6 | | | |------------->| | | | 200 OK F7 | | | |<-------------| | | | 487 F8 | | | |<-------------| | | | ACK F9 | | | |------------->| | |(181 Call is Being Forwarded) F10 | |<---------------| | INVITE F11 | | |--------------------------------->| | | | 180 Ringing F12 | | 180 Ringing F13|<---------------------------------| |<---------------| | 200 OK F14 | | |<---------------------------------| | 200 OK F15 | | | |<---------------| | | | ACK F16 | | | |--------------->| | ACK F17 | | |--------------------------------->| | Both way RTP Established | |<=================================================>| | BYE F18 | | | |--------------->| | BYE F19 | | |--------------------------------->| | | | 200 OK F20 | | 200 OK F21 |<---------------------------------| |<---------------| | | | | | | Bob wants calls to B1 forwarded to B2 if B1 is not answered (information is known to the proxy server). Alice calls B1 and no one answers. The proxy server then places the call to B2. Johnston, et al. Best Current Practice [Page 92]
RFC 5359 SIP Service Examples October 2008 Message Details F1 INVITE Alice -> Proxy INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 INVITE Proxy -> B1 INVITE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= Johnston, et al. Best Current Practice [Page 93]
RFC 5359 SIP Service Examples October 2008 c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F3 (100 Trying) Proxy -> Alice SIP/2.0 100 Trying Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 F4 180 Ringing B1 -> Proxy SIP/2.0 180 Ringing Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=3145678 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Content-Length: 0 F5 180 Ringing Proxy -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=3145678 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Johnston, et al. Best Current Practice [Page 94]
RFC 5359 SIP Service Examples October 2008 Contact: <sips:bob@client.biloxi.example.com> Content-Length: 0 /* B1 rings until a configurable timer expires in the proxy. The proxy sends Cancel and proceeds down the list of routes. */ F6 CANCEL Proxy -> B1 CANCEL sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 CANCEL Content-Length: 0 F7 200 OK B1 -> Proxy SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 ;received=192.0.2.54 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=329d823 Call-ID: 12345600@atlanta.example.com CSeq: 1 CANCEL Content-Length: 0 F8 487 Request Terminated B1 -> Proxy SIP/2.0 487 Request Terminated Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=3145678 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 Johnston, et al. Best Current Practice [Page 95]
RFC 5359 SIP Service Examples October 2008 F9 ACK Proxy -> B1 ACK sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=3145678 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 F10 (181 Call is Being Forwarded) Proxy -> Alice SIP/2.0 181 Call is Being Forwarded Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=9214d Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 F11 INVITE Proxy -> B2 INVITE sips:bob@client2.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.2 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= Johnston, et al. Best Current Practice [Page 96]
RFC 5359 SIP Service Examples October 2008 c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F12 180 Ringing B2 -> Proxy SIP/2.0 180 Ringing Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.2 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client2.biloxi.example.com> Content-Length: 0 F13 180 Proxy -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client2.biloxi.example.com> Content-Length: 0 F14 200 OK B2 -> Proxy SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.2 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Johnston, et al. Best Current Practice [Page 97]
RFC 5359 SIP Service Examples October 2008 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client2.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844527 IN IP4 client2.biloxi.example.com s= c=IN IP4 client2.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F15 200 OK Proxy -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client2.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844527 IN IP4 client2.biloxi.example.com s= c=IN IP4 client2.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F16 ACK Alice -> Proxy ACK sips:bob@client2.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 Johnston, et al. Best Current Practice [Page 98]
RFC 5359 SIP Service Examples October 2008 ;branch=z9hG4bK74bf3 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 F17 ACK Proxy -> B2 ACK sips:bob@client2.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK8374.1 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf3 ;received=192.0.2.103 Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 /* RTP streams are established between Alice and B2. Alice hangs up with User B2. */ F18 BYE Alice -> Proxy BYE sips:bob@client2.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74b3f Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F19 BYE Proxy -> B2 BYE sips:bob@client2.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK837.1 Johnston, et al. Best Current Practice [Page 99]
RFC 5359 SIP Service Examples October 2008 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74b3f ;received=192.0.2.103 Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F20 200 OK B2 -> Proxy SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK837.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74b3f ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F21 200 OK Proxy -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74b3f ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 2 BYE Content-Length: 0 Johnston, et al. Best Current Practice [Page 100]
RFC 5359 SIP Service Examples October 2008 2.10. 3-Way Conference - Third Party Is Added Alice Bob Carol | INVITE F1 | | |--------------->| | | 180 Ringing F2 | | |<---------------| | | 200 OK F3 | | |<---------------| | | ACK F4 | | |--------------->| | | RTP | | |<==============>| | | INVITE F5 | | |<---------------| | | 200 OK F6 | | |--------------->| | | ACK F7 | | |<---------------| INVITE F8 | | |------------->| | | 180 F9 | | |<-------------| | | 200 OK F10 | | |<-------------| | | ACK F11 | | |------------->| | | RTP | | |<============>| In this scenario, Alice and Bob are in a 2-party call (session) when Bob wishes to add Carol into the conversation. Bob is capable of media mixing in a 3-party call. Bob first sends a re-INVITE to Alice, changing Contact URIs to one that indicates Bob's mixer and acts like a focus. As a result, Bob includes the "isfocus" feature tag [RFC3840] as described in [RFC4579]. Bob then INVITEs Carol using the same Contact URI. Note that Bob could wait to re-INVITE Alice until after Carol has answered. Bob could also put Alice on hold before calling Carol. Message Details F1 INVITE Alice -> Bob INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Johnston, et al. Best Current Practice [Page 101]
RFC 5359 SIP Service Examples October 2008 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 180 Ringing Bob -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:b54gh42f5@biloxi.example.com> Content-Length: 0 F3 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:b54gh42f5@biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Johnston, et al. Best Current Practice [Page 102]
RFC 5359 SIP Service Examples October 2008 Supported: replaces, gruu Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F4 ACK Alice -> Bob ACK sips:b54gh42f5@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfL Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 /* Alice and Bob have established a session. Bob re-INVITEs, changing Contact URIs. */ F5 INVITE Bob -> Alice INVITE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=23431 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1024 INVITE Contact: <sips:bob-Mixer@client.biloxi.example.com>;isfocus Content-Type: application/sdp Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces, gruu Content-Length: ... v=0 o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com s= Johnston, et al. Best Current Practice [Page 103]
RFC 5359 SIP Service Examples October 2008 c=IN IP4 client.biloxi.example.com t=0 0 m=audio 49172 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F6 200 OK Alice -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=23431 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1024 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F7 ACK Bob -> Alice ACK sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnash3G Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=23431 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1024 ACK Content-Length: 0 /* Bob calls Carol. */ Johnston, et al. Best Current Practice [Page 104]
RFC 5359 SIP Service Examples October 2008 F8 INVITE Bob -> Carol INVITE sips:carol@chicago.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashJfd Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com> Call-ID: sdjfdjfskdf@biloxi.example.com CSeq: 42 INVITE Contact: <sips:bob-Mixer@client.biloxi.example.com>;isfocus Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces, gruu Content-Type: application/sdp Content-Length: ... v=0 o=bob 28908445834 2890844834 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 48174 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F9 180 Ringing Carol -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashJfd ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=341313 Call-ID: sdjfdjfskdf@biloxi.example.com CSeq: 42 INVITE Contact: <sips:carol@client.chicago.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 F10 200 OK Carol -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashJfd ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 Johnston, et al. Best Current Practice [Page 105]
RFC 5359 SIP Service Examples October 2008 To: Carol <sips:carol@chicago.example.com>;tag=341313 Call-ID: sdjfdjfskdf@biloxi.example.com CSeq: 42 INVITE Contact: <sips:carol@client.chicago.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=carol 2890844922 2890844922 IN IP4 client.chicago.example.com s= c=IN IP4 client.chicago.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F11 ACK Bob -> Carol ACK sips:carol@client.chicago.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnash431 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=341313 Call-ID: sdjfdjfskdf@biloxi.example.com CSeq: 42 ACK Content-Length: 0 /* Bob's mixer now mixes media from both Alice and Carol to create the 3-way conference. */ Johnston, et al. Best Current Practice [Page 106]
RFC 5359 SIP Service Examples October 2008 2.11. 3-Way Conference - Third Party Joins Alice Bob Carol | INVITE F1 | | |--------------->| | | 180 Ringing F2 | | |<---------------| | | 200 OK F3 | | |<---------------| | | ACK F4 | | |--------------->| | | RTP | | |<==============>| INVITE Join:A-B F5 | |<-------------| | | 180 F6 | | |------------->| | INVITE F7 | | |<---------------| | | 200 OK F8 | | |--------------->| | | ACK F9 | | |<---------------| | | | 200 OK F10 | | |------------->| | | ACK F11 | | |<-------------| | | RTP | | |<============>| In this scenario, Alice and Bob are in a 2-party call and Carol wishes to join, resulting in a 3-party call. Carol could have learned Bob's dialog identifier using some non-SIP means, or possibly from a NOTIFY with the dialog package sent by Bob. Carol sends an INVITE to Bob containing a Join header identifying the dialog between Alice and Bob. Bob re-INVITEs Alice to switch to focus mode and includes the "isfocus" feature tag [RFC3840] as described in [RFC4579]. Bob then accepts the INVITE from Carol, resulting in the 3-way call. Message Details F1 INVITE Alice -> Bob INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Johnston, et al. Best Current Practice [Page 107]
RFC 5359 SIP Service Examples October 2008 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 180 Ringing Bob -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:b54gh42f5@biloxi.example.com> Content-Length: 0 F3 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:b54gh42f5@biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Johnston, et al. Best Current Practice [Page 108]
RFC 5359 SIP Service Examples October 2008 Supported: replaces, join, gruu Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F4 ACK Alice -> Bob ACK sips:b54gh42f5@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf6 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 /* Alice and Bob have established a session. Carol requests to join the session. */ F5 INVITE Carol -> Bob INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS chicago.example.com:5061 ;branch=z9hG4bKnashds7 Max-Forwards: 70 From: Carol <sips:carol@chicago.example.com>;tag=8675309 To: Bob <sips:bob@biloxi.example.com> Call-ID: 452k499sk@chicago.example.com CSeq: 99 INVITE Contact: <sips:carol@client.chicago.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces, join Join: 12345600@atlanta.example.com;from-tag=1234567;to-tag=23431 Content-Type: application/sdp Content-Length: ... Johnston, et al. Best Current Practice [Page 109]
RFC 5359 SIP Service Examples October 2008 v=0 o=carol 2890844922 2890844922 IN IP4 client.chicago.example.com s= c=IN IP4 client.chicago.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F6 180 Ringing Bob -> Carol SIP/2.0 180 Ringing Via: SIP/2.0/TLS chicago.example.com:5061 ;branch=z9hG4bKnashds7 ;received=120. From: Carol <sips:carol@chicago.example.com>;tag=8675309 To: Bob <sips:bob@biloxi.example.com>;tag=0982 Call-ID: 452k499sk@chicago.example.com CSeq: 99 INVITE Contact: <sips:bob-Mixer@client.biloxi.example.com>;isfocus Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Length: 0 F7 INVITE Bob -> Alice INVITE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashdyKL Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=23431 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1024 INVITE Contact: <sips:bob-Mixer@client.biloxi.example.com>;isfocus Content-Type: application/sdp Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces, join, gruu Content-Length: ... v=0 o=bob 2890844527 2890844528 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 49172 RTP/AVP 0 a=rtpmap:0 PCMU/8000 Johnston, et al. Best Current Practice [Page 110]
RFC 5359 SIP Service Examples October 2008 F8 200 OK Alice -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashdyKL ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=23431 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1024 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F9 ACK Bob -> Alice ACK sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnash3g Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=23431 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1024 ACK Content-Length: 0 F10 200 OK Bob -> Carol SIP/2.0 200 OK Via: SIP/2.0/TLS chicago.example.com:5061 ;branch=z9hG4bKnashds7 ;received=120. From: Carol <sips:carol@chicago.example.com>;tag=8675309 To: Bob <sips:bob@biloxi.example.com>;tag=0982 Call-ID: 452k499sk@chicago.example.com CSeq: 99 INVITE Contact: <sips:bob-Mixer@client.biloxi.example.com>;isfocus Johnston, et al. Best Current Practice [Page 111]
RFC 5359 SIP Service Examples October 2008 Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces, join, gruu Content-Type: application/sdp Content-Length: ... v=0 o=bob 28908445834 2890844834 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 48174 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F11 ACK OK Carol -> Bob ACK sips:bob-Mixer@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS chicago.example.com:5061 ;branch=z9hG4bKnash4Gf Max-Forwards: 70 From: Carol <sips:carol@chicago.example.com>;tag=8675309 To: Bob <sips:bob@biloxi.example.com>;tag=0982 Call-ID: 452k499sk@chicago.example.com CSeq: 99 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces, join Content-Length:0 Johnston, et al. Best Current Practice [Page 112]
RFC 5359 SIP Service Examples October 2008 2.12. Find-Me Alice Proxy User User User User B1 B2 B3 B4 | | | | | | | INVITE F1 | | | | | |--------------->| INVITE F2 | | | | | |------------->| | | | |(100 Trying) F3 | | | | | |<---------------|180 Ringing F4| | | | | |<-------------| | | | | 180 Ringing F5 | | | | | |<---------------| | | | | | | Timeout | | | | | | | | | | | | CANCEL F6 | | | | | |------------->| | | | | | 200 OK F7 | | | | | |<-------------| | | | | | 487 F8 | | | | | |<-------------| | | | | | ACK F9 | | | | | |------------->| | | | | | INVITE F10 | | | | |-------------------->| | | | |480 Not Logged In F11| | | | |<--------------------| | | | | ACK F12| | | | |-------------------->| | | | | INVITE F13 | | | |--------------------------->| | | | 486 Busy Here F14 | | | |<---------------------------| | | | ACK F15 | | | |--------------------------->| | | | INVITE F16 | | |---------------------------------->| | | 180 Ringing F17 | | 180 F18 |<----------------------------------| |<---------------| 200 OK F19 | | 200 OK F20 |<----------------------------------| |<---------------| | | ACK F21 | | |--------------->| ACK F22 | | |---------------------------------->| | Both way RTP Established | |<==================================================>| Johnston, et al. Best Current Practice [Page 113]
RFC 5359 SIP Service Examples October 2008 | | BYE F23 | | BYE F24 |<----------------------------------| |<---------------| | | 200 OK F25 | | |--------------->| 200 OK F26 | | |---------------------------------->| | | | Alice's call to Bob will result in an attempt to locate Bob by calling locations from a list of contacts. The location to answer the call becomes the active set; no other sets may join the call. While this flow shows a sequential search, the search could be accomplished using parallel forking. Message Details F1 INVITE Alice -> Proxy INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t= 0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 INVITE Proxy -> B1 INVITE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Johnston, et al. Best Current Practice [Page 114]
RFC 5359 SIP Service Examples October 2008 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t= 0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F3 (100 Trying) Proxy -> Alice SIP/2.0 100 Trying Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 F4 180 Ringing B1 -> Proxy SIP/2.0 180 Ringing Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Content-Length: 0 Johnston, et al. Best Current Practice [Page 115]
RFC 5359 SIP Service Examples October 2008 F5 180 Ringing Proxy -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Content-Length: 0 /* B1 rings until a configurable timer in the proxy expires. The proxy then sends Cancel and proceeds down the list of routes. */ F6 CANCEL Proxy -> B1 CANCEL sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 CANCEL Content-Length: 0 F7 200 OK B1 -> Proxy SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 ;received=192.0.2.54 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 1 CANCEL Content-Length: 0 F8 487 Request Terminated B1 -> Proxy SIP/2.0 487 Request Terminated Johnston, et al. Best Current Practice [Page 116]
RFC 5359 SIP Service Examples October 2008 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 F9 ACK Proxy -> B1 ACK sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.1 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=765432 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 F10 INVITE Proxy -> B2 INVITE sips:bob@client2.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.2 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com Johnston, et al. Best Current Practice [Page 117]
RFC 5359 SIP Service Examples October 2008 t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F11 480 Not Logged In B2 -> Proxy SIP/2.0 480 Not Logged In Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.2 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314756 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 F12 ACK Proxy -> B2 ACK sips:bob@client2.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.2 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314756 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 F13 INVITE Proxy -> B3 INVITE sips:bob@client3.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.3 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Johnston, et al. Best Current Practice [Page 118]
RFC 5359 SIP Service Examples October 2008 Contact: <sips:alice@client.atlanta.example.com> Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F14 486 Busy Here B3 -> Proxy SIP/2.0 486 Busy Here Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.3 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7654321 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 F15 ACK Proxy -> B3 ACK sips:bob@client3.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.3 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7654321 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 F16 INVITE Proxy -> B4 INVITE sips:bob@client4.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.4 Via: SIP/2.0/TLS client.atlanta.example.com:5061 Johnston, et al. Best Current Practice [Page 119]
RFC 5359 SIP Service Examples October 2008 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F17 180 Ringing B4 -> Proxy SIP/2.0 180 Ringing Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.4 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7137136 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client4.biloxi.example.com> Content-Length: 0 F18 180 Ringing Proxy -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7137136 Johnston, et al. Best Current Practice [Page 120]
RFC 5359 SIP Service Examples October 2008 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client4.biloxi.example.com> Content-Length: 0 F19 200 OK B4 -> Proxy SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83749.4 ;received=192.0.2.54 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7137136 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client4.biloxi.example.com> Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844527 IN IP4 client4.biloxi.example.com s= c=IN IP4 client4.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F20 200 OK Proxy -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 Record-Route: <sips:ss1.example.com;lr> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7137136 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client4.biloxi.example.com> Content-Type: application/sdp Content-Length: ... Johnston, et al. Best Current Practice [Page 121]
RFC 5359 SIP Service Examples October 2008 v=0 o=bob 2890844527 2890844527 IN IP4 client4.biloxi.example.com s= c=IN IP4 client4.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F21 ACK Alice -> Proxy ACK sips:bob@client4.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7137136 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 F22 ACK Proxy -> B4 ACK sips:bob@client4.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK8374 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf ;received=192.0.2.103 Max-Forwards: 69 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7137136 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 /* RTP streams are established between Alice and B4. */ /* User B4 hangs up with Alice. */ F23 BYE B4 -> Proxy BYE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client4.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 Johnston, et al. Best Current Practice [Page 122]
RFC 5359 SIP Service Examples October 2008 Route: <sips:ss1.example.com;lr> Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=7137136 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1 BYE Content-Length: 0 F24 BYE Proxy -> Alice BYE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83754 Via: SIP/2.0/TLS client4.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.105 Max-Forwards: 69 From: Bob <sips:bob@biloxi.example.com>;tag=7137136 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1 BYE Content-Length: 0 F25 200 OK Alice -> Proxy SIP/2.0 200 OK Via: SIP/2.0/TLS ss1.example.com:5061 ;branch=z9hG4bK83754 ;received=192.0.2.54 Via: SIP/2.0/TLS client4.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.105 From: Bob <sips:bob@biloxi.example.com>;tag=7137136 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1 BYE Content-Length: 0 F26 200 OK Proxy -> B4 SIP/2.0 200 OK Via: SIP/2.0/TLS client4.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.105 From: Bob <sips:bob@biloxi.example.com>;tag=7137136 Johnston, et al. Best Current Practice [Page 123]
RFC 5359 SIP Service Examples October 2008 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 1 BYE Content-Length: 0 Johnston, et al. Best Current Practice [Page 124]
RFC 5359 SIP Service Examples October 2008 2.13. Call Management (Incoming Call Screening) Announcement Alice Proxy Bob Server | | | | | INVITE F1 | | | |------------------------------>| | | 305 Use Proxy F2 | | |<------------------------------| | | ACK F3 | | | |------------------------------>| | | INVITE F4 | | | |--------------->| | | | 407 Proxy Authentication F5 | | |<---------------| | | | ACK F6 | | | |--------------->| | | | INVITE F7 | | | |--------------->| | | | 403 Screening Failure (Terminating) Error-Info: URI F8 |<---------------| | | | ACK F9 | | | |--------------->| | | | INVITE F10 | | | |--------------------------------------------->| | 200 OK F11 | | | |--------------------------------------------->| | ACK F12 | | |--------------------------------------------->| | Announcement Played to Caller | |<=============================================| | BYE F13 | |<---------------------------------------------| | 200 OK F14 | |--------------------------------------------->| | | | | | | Bob has an incoming call screening list; Alice is included on the list of addresses from which Bob will not accept calls. Alice attempts to call Bob. Messages F1, F2, and F3 are included to show that Bob does not accept INVITEs that have not been screened by the proxy. Note that call screening cannot be done using the From header -- instead some form of authentication credentials must be used. Johnston, et al. Best Current Practice [Page 125]
RFC 5359 SIP Service Examples October 2008 The screening proxy inserts an announcement URI in an Error-Info header field, which Alice accesses by sending an INVITE to listen to the Announcement. The Announcement Server uses the automaton and rendering feature tags in F12 and F13 to indicate that it is a media server only capable of playing announcements. Message Details F1 INVITE Alice -> Bob INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 /* Bob only accepts INVITEs that have been screened by the proxy. */ F2 305 Use Proxy Bob -> Alice SIP/2.0 305 Use Proxy Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=342123 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:ss1.example.com> Content-Length: 0 Johnston, et al. Best Current Practice [Page 126]
RFC 5359 SIP Service Examples October 2008 F3 ACK Alice -> Bob ACK sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=342123 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 /* A retries the call through the proxy. */ F4 INVITE Alice -> Proxy 1 INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf0 Max-Forwards: 70 Route: <sips:ss1.example.com> From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 2 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 /* Proxy 1 challenges Alice for authentication. */ F5 407 Proxy Authentication Required Proxy 1 -> Alice SIP/2.0 407 Proxy Authentication Required Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf0 ;received=192.0.2.103 Johnston, et al. Best Current Practice [Page 127]
RFC 5359 SIP Service Examples October 2008 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7886765 Call-ID: 12345600@atlanta.example.com CSeq: 2 INVITE Proxy-Authenticate: Digest realm="example.com", nonce="ea9c8e88df84f1cec4341ae6cbe5a359", qop="auth", nc=00000001, cnonce="0a4f113b", opaque="", stale=FALSE, algorithm=MD5 Content-Length: 0 F6 ACK Alice -> Proxy 1 ACK sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf0 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=7886765 Call-ID: 12345600@atlanta.example.com CSeq: 2 ACK Content-Length: 0 /* Alice responds by sending an INVITE with authentication credentials in it. */ F7 INVITE Alice -> Proxy 1 INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf2 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 3 INVITE Contact: <sips:alice@client.atlanta.example.com> Proxy-Authorization: Digest username="alice", realm="example.com", qop=auth, nc=00000001, cnonce="4gr84543ft2", nonce="ae9137be1c87d175c2dd63302a0d6e0a", opaque="", uri="sips:bob@biloxi.example.com", response="bbaec39f943bdcb3620d90afc548a45c" Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... Johnston, et al. Best Current Practice [Page 128]
RFC 5359 SIP Service Examples October 2008 v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F8 403 Screening Failure (Terminating) Proxy 1 -> Alice SIP/2.0 403 Screening Failure (Terminating) Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf2 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=ffe254 Call-ID: 12345600@atlanta.example.com CSeq: 3 INVITE Error-Info: <sips:screen-fail-term-ann@ms.biloxi.example.com> Content-Length: 0 F9 ACK Alice -> Proxy 1 ACK sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf2 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=ffe254 Call-ID: 12345600@atlanta.example.com Proxy-Authorization: Digest username="alice", realm="example.com", nonce="ae9137be1c87d175c2dd63302a0d6e0a", opaque="", uri="sips:bob@biloxi.example.com", response="bbaec39f943bdcb3620d90afc548a45c" CSeq: 3 ACK Content-Length: 0 /* To hear the recording, Alice connects to the Error-Info URI. */ F10 INVITE Alice -> Proxy 1 INVITE sips:screen-fail-term-ann@ms.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfj Max-Forwards: 70 Johnston, et al. Best Current Practice [Page 129]
RFC 5359 SIP Service Examples October 2008 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 4 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F11 200 OK Announcement Server -> Proxy 1 SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfj ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=234934 Call-ID: 12345600@atlanta.example.com CSeq: 4 INVITE Contact: <sips:ms.biloxi.example.com> ;automaton;+sip.rendering="no" Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=annc 2890844543 2890844543 IN IP4 announce.biloxi.example.com s= c=IN IP4 announce.biloxi.example.com t=0 0 m=audio 49174 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F12 ACK Alice -> Announcement Server ACK sips:ms.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74b32 Johnston, et al. Best Current Practice [Page 130]
RFC 5359 SIP Service Examples October 2008 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=234934 Call-ID: 12345600@atlanta.example.com CSeq: 4 ACK Content-Length: 0 /* Announcement Server plays announcement then disconnects. */ F13 BYE Announcement Server -> Alice BYE sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS announcement.example.com:5061 ;branch=z9hG4bK74bKS Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=234934 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 2334 BYE Content-Length: 0 F14 200 OK Alice -> Announcement Server SIP/2.0 200 OK Via: SIP/2.0/TLS announcement.example.com:5061 ;branch=z9hG4bK74bKS ;received=192.0.2.103 From: Bob <sips:bob@biloxi.example.com>;tag=234934 To: Alice <sips:alice@atlanta.example.com>;tag=1234567 Call-ID: 12345600@atlanta.example.com CSeq: 2334 BYE Content-Length: 0 Johnston, et al. Best Current Practice [Page 131]
RFC 5359 SIP Service Examples October 2008 2.14. Call Management (Outgoing Call Screening) Alice Proxy Bob | | | | INVITE F1 | | |--------------->| | | 407 Proxy Authentication F2 | |<---------------| | | ACK F3 | | |--------------->| | | INVITE F4 | | |--------------->| | | 403 Screening Failure (Originating) F5 |<---------------| | | ACK F6 | | |--------------->| | | | | Alice has an outgoing call screening list; Bob is included on the list of addresses to which Alice will not be able to place a call. Alice attempts to call Bob. Alice could establish a session to listen to the announcement in the Error-Info header field. Message Details F1 INVITE Alice -> Proxy 1 INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 Johnston, et al. Best Current Practice [Page 132]
RFC 5359 SIP Service Examples October 2008 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 /* Proxy 1 challenges Alice for authentication. */ F2 407 Proxy Authentication Required Proxy 1 -> Alice SIP/2.0 407 Proxy Authentication Required Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=90210 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Proxy-Authenticate: Digest realm="example.com", nonce="ea9c8e88df84f1cec4341ae6cbe5a359", qop="auth", nc=00000001, cnonce="0a4f113b", opaque="", stale=FALSE, algorithm=MD5 Content-Length: 0 F3 ACK Alice -> Proxy 1 ACK sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=90210 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 /* Alice responds be sending an INVITE with authentication credentials in it. */ F4 INVITE Alice -> Proxy 1 INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74b4 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com Johnston, et al. Best Current Practice [Page 133]
RFC 5359 SIP Service Examples October 2008 CSeq: 2 INVITE Contact: <sips:alice@client.atlanta.example.com> Proxy-Authorization: Digest username="alice", realm="example.com", nonce="cb360afc54bbaec39f943bd820d9a45c", opaque="", uri="sips:bob@biloxi.example.com", response="b9d2e5bcdec9f69ab2a9b44f270285a6" Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F5 403 Screening Failure (Originating) Proxy 1 -> Alice SIP/2.0 403 Screening Failure (Originating) Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74b4 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=18017 Call-ID: 12345600@atlanta.example.com CSeq: 2 INVITE Error-Info: <sips:screen-fail-orig-ann@announcement.example.com> Content-Length: 0 F6 ACK Alice -> Proxy 1 ACK sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74b4 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=18017 Call-ID: 12345600@atlanta.example.com CSeq: 2 ACK Proxy-Authorization: Digest username="alice", realm="example.com", nonce="cb360afc54bbaec39f943bd820d9a45c", opaque="", uri="sips:bob@biloxi.example.com", response="b9d2e5bcdec9f69ab2a9b44f270285a6" Content-Length: 0 Johnston, et al. Best Current Practice [Page 134]
RFC 5359 SIP Service Examples October 2008 2.15. Call Park Alice Bob Park Server Carol | | | | | INVITE F1 | | | |------------->| | | |180 Ringing F2| | | |<-------------| | | | 200 OK F3 | | | |<-------------| | | | ACK F4 | | | |------------->| | | | RTP Media | | | |<============>| | | | Bob Parks Call | | | | REFER Refer-To: A F5 | | |------------->| | | | 202 F6 | | | |<-------------| | | | NOTIFY F7 | | | |<-------------| | | | 200 F8 | | | |------------->| | | INVITE F9 Replaces: B | | |<----------------------------| | | 200 OK F10 | | |---------------------------->| | | ACK F11 | | |<----------------------------| | | RTP Music | | |<===========================>| | | BYE F12 | | | |------------->| NOTIFY F14 | | | 200 OK F13 |<-------------| | |<-------------| 200 OK F15 | | | |------------->| | | | Carol picks up the call | | | | | | | | SUBSCRIBE F16| | | |<-------------| | | | 200 OK F17 | | | |------------->| | | | NOTIFY F18 | | | |------------->| | | | 200 OK F19 | | | |<-------------| | INVITE Replaces: Park Server F20 | |<-------------------------------------------| Johnston, et al. Best Current Practice [Page 135]
RFC 5359 SIP Service Examples October 2008 | | | 200 F21 | |------------------------------------------->| | | | ACK F22 | |<-------------------------------------------| | RTP Media | |<==========================================>| | BYE F23 | | |---------------------------->| | | 200 OK F24 | | |<----------------------------| | | No more RTP Music | | In this example, Alice calls Bob. Bob then parks the call at the Park Server by sending a REFER to the Park Server. The server sends an INVITE to Alice, which replaces the session between Alice and Bob. The Park Server utilizes the automaton, rendering, and byeless feature tags in F9 to indicate its capabilities to Alice. The call is accepted by Alice and causes Alice to send a BYE to Bob. Bob receives notification of the successful park, and also receives the dialog identifiers in the application/sip body of the NOTIFY response. Carol wishes to retrieve the call, so she sends an INVITE containing the dialog identifiers to Alice, which replaces the session with the Park Server. Alice accepts the call and sends a BYE to the Park Server. Carol obtains the dialog identifiers from a NOTIFY from the Park Server. Note that this call flow is a special case of call transfer. Note also that this flow could also be used for Music on Hold. Message Details F1 INVITE Alice -> Bob INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.alice.example.com:5061 ;branch=z9hG4bKnashds7 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:a8342043f@atlanta.example.com;gr> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces, gruu Content-Type: application/sdp Johnston, et al. Best Current Practice [Page 136]
RFC 5359 SIP Service Examples October 2008 Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 180 Ringing Bob -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.105 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Content-Length: 0 F3 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.105 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844527 2890844527 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 Johnston, et al. Best Current Practice [Page 137]
RFC 5359 SIP Service Examples October 2008 F4 ACK Alice -> Bob ACK sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bKnashds7 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 1 ACK Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces Content-Length: 0 /* Bob REFERs Park Server to establish session with Alice, which replaces the established session between Alice and Bob. Note that there is no session established between Bob and the Park Server. */ F5 REFER Bob -> Park Server REFER sips:park@server.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds9 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=02134 To: Park Server <sips:park@server.example.com> Call-ID: 4802029847@biloxi.example.com CSeq: 1 REFER <allOneLine> Refer-To: <sips:a8342043f@atlanta.example.com;gr?Replaces= 12345601%40atlanta.example.com%3Bfrom-tag%3D314159 %3Bto-tag%3D1234567&Require=replaces> </allOneLine> Referred-By: <sips:bob@biloxi.example.com> Contact: <sips:bob@client.biloxi.example.com> Content-Length: 0 F6 202 Accepted Park Server -> Bob SIP/2.0 202 Accepted Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds9 ;received=192.0.2.105 From: Bob <sips:bob@biloxi.example.com>;tag=02134 To: Park Server <sips:park@server.example.com>;tag=56323 Johnston, et al. Best Current Practice [Page 138]
RFC 5359 SIP Service Examples October 2008 Call-ID: 4802029847@biloxi.example.com Contact: <sips:park@server.example.com> CSeq: 1 REFER Content-Length: 0 F7 NOTIFY Park Server -> Bob NOTIFY sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74bT6 To: Bob <sips:bob@biloxi.example.com>;tag=02134 Max-Forwards: 70 From: Park Server <sips:park@server.example.com>;tag=56323 Call-ID: 4802029847@biloxi.example.com CSeq: 1 NOTIFY Event: refer Contact: <sips:park@server.example.com> Subscription-State: active;expires=60 Content-Type: message/sipfrag Content-Length: ... SIP/2.0 100 Trying F8 200 OK Bob -> Park Server SIP/2.0 200 OK Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74bT6 ;received=192.0.2.103 To: Bob <sips:bob@biloxi.example.com>;tag=02134 From: Park Server <sips:park@server.example.com>;tag=56323 Call-ID: 4802029847@biloxi.example.com CSeq: 1 NOTIFY Content-Length: 0 /* Park Server places call to Alice to replace session between Alice and Bob. */ F9 INVITE Park Server -> Alice INVITE sips:a8342043f@atlanta.example.com;gr SIP/2.0 Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74rf Max-Forwards: 70 From: <sips:park@server.example.com>;tag=0111 Johnston, et al. Best Current Practice [Page 139]
RFC 5359 SIP Service Examples October 2008 To: <sips:a8342043f@atlanta.example.com;gr> Call-ID: a5-75-34-12-76@server.example.com CSeq: 1 INVITE Referred-By: <sips:bob@biloxi.example.com> Contact: <sips:park@server.example.com>;automaton ;+sip.byeless;+sip.rendering="no" Require: replaces Replaces: 12345601@atlanta.example.com ;from-tag=314159;to-tag=1234567 Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=ParkServer 2890844576 2890844576 IN IP4 Park.server.example.com s= c=IN IP4 server.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F10 200 OK Alice -> Park Server SIP/2.0 200 OK Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74rf ;received=192.0.2.103 From: <sips:park@server.example.com>;tag=0111 To: <sips:a8342043f@atlanta.example.com;gr>;tag=098594 Call-ID: a5-75-34-12-76@server.example.com CSeq: 1 INVITE Contact: <sips:a8342043f@atlanta.example.com;gr> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces, gruu Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 a=recvonly Johnston, et al. Best Current Practice [Page 140]
RFC 5359 SIP Service Examples October 2008 F11 ACK Park Server -> Alice ACK sips:a8342043f@atlanta.example.com;gr SIP/2.0 Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK7rfF Max-Forwards: 70 From: <sips:park@server.example.com>;tag=0111 To: <sips:a8342043f@atlanta.example.com;gr>;tag=098594 Call-ID: a5-75-34-12-76@server.example.com CSeq: 1 ACK Content-Length: 0 F12 BYE Alice -> Bob BYE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bKnashds7 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 2 BYE Content-Length: 0 F13 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.105 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 12345601@atlanta.example.com CSeq: 2 BYE Content-Length: 0 /* Park Server reports success back to Bob by returning a 200 OK response. Bob obtains the dialog identifiers from the headers included in the response. */ F14 NOTIFY Park Server -> Bob NOTIFY sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74bf9 Johnston, et al. Best Current Practice [Page 141]
RFC 5359 SIP Service Examples October 2008 To: Bob <sips:bob@biloxi.example.com>;tag=02134 Max-Forwards: 70 From: Park Server <sips:park@server.example.com>;tag=56323 Call-ID: 4802029847@biloxi.example.com CSeq: 2 NOTIFY Event: refer Subscription-State: terminated;reason=noresource Contact: <sips:park@server.example.com>;automaton ;+sip.byeless;+sip.rendering="no" Content-Type: message/sipfrag Content-Length: ... SIP/2.0 200 OK Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74rf ;received=192.0.2.103 From: <sips:park@server.example.com>;tag=0111 To: <sips:a8342043f@atlanta.example.com;gr>;tag=098594 Call-ID: a5-75-34-12-76@server.example.com CSeq: 1 INVITE Contact: <sips:a8342043f@atlanta.example.com;gr> F15 200 OK Bob -> Park Server SIP/2.0 200 OK Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 To: Bob <sips:bob@biloxi.example.com>;tag=02134 From: Park Server <sips:park@server.example.com>;tag=56323 Call-ID: 4802029847@biloxi.example.com CSeq: 2 NOTIFY Content-Length: 0 /* Alice is now parked at the Park Server. */ /* Carol picks up the call by sending an INVITE to A, which replaces the existing session with the Park Server. Carol needs to know the dialog information to construct the Replaces header. */ F16 SUBSCRIBE Carol -> Park Server SUBSCRIBE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.chicago.example.com:5061 ;branch=z9hG4bK74b232 Johnston, et al. Best Current Practice [Page 142]
RFC 5359 SIP Service Examples October 2008 Max-Forwards: 70 From: Carol <sips:carol@chicago.example.com>;tag=158x93461 To: <sips:park@server.example.com> Call-ID: 2d6485356dfaj34dsf CSeq: 1 SUBSCRIBE Contact: <sips:carol@client.chicago.example.com> Event: dialog Expires: 0 Accept: application/dialog-info+xml Content-Length: 0 F17 200 OK Park Server -> Carol SIP/2.0 200 OK Via: SIP/2.0/TLS client.chicago.example.com:5061 ;branch=z9hG4bK74b232 ;received=192.0.2.105 From: Carol <sips:carol@chicago.example.com>;tag=158x93461 To: <sips:park@server.example.com>;tag=3213j Call-ID: 2d6485356dfaj34dsf CSeq: 1 SUBSCRIBE Contact: <sips:park@server.example.com>;automaton ;+sip.byeless;+sip.rendering="no" Content-Length: 0 F18 NOTIFY Park Server -> Carol NOTIFY sips:carol@client.example.com SIP/2.0 Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74b8skd Max-Forwards: 70 To: Carol <sips:carol@chicago.example.com>;tag=158x93461 From: <sips:park@server.example.com>;tag=3213j Call-ID: 2d6485356dfaj34dsf CSeq: 1 NOTIFY Contact: <sips:park@server.example.com>;automaton ;+sip.byeless;+sip.rendering="no" Event: dialog Subscription-State: terminated;reason=timeout Content-Type: application/dialog-info+xml Content-Length: ... <?xml version="1.0"?> <dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="0" state="full" entity="sips:park@server.example.com"> <dialog id="439920143524" call-id="a5-75-34-12-76@server.example.com" Johnston, et al. Best Current Practice [Page 143]
RFC 5359 SIP Service Examples October 2008 local-tag="0111" remote-tag="098594" direction="initiator"> <duration>1</duration> <local> <target>sips:park@server.example.com</target> </local> <remote> <target>sips:a8342043f@atlanta.example.com;gr</target> </remote> <state>confirmed</state> </dialog> </dialog-info> F19 200 OK Carol -> Park Server SIP/2.0 200 OK Via: SIP/2.0/TLS server.example.com:5061 ;branch=z9hG4bK74b8skd ;received=192.0.2.103 To: Carol <sips:carol@chicago.example.com>;tag=158x93461 From: <sips:park@server.example.com>;tag=3213j Call-ID: 2d6485356dfaj34dsf CSeq: 1 NOTIFY Contact: <sips:carol@client.chicago.example.com> Content-Length: 0 F20 INVITE Carol -> Alice INVITE sips:alice@atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.chicago.example.com:5061 ;branch=z9hG4bK74bQ2 Max-Forwards: 70 From: Carol <sips:carol@chicago.example.com>;tag=5893461 To: Alice <sips:alice@atlanta.example.com> Call-ID: 6485356@chicago.example.com CSeq: 1 INVITE Contact: <sips:carol@client.chicago.example.com> Require: replaces Replaces: a5-75-34-12-76@server.example.com ;to-tag=098594;from-tag=0111 Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 Johnston, et al. Best Current Practice [Page 144]
RFC 5359 SIP Service Examples October 2008 o=carol 2890844922 2890844922 IN IP4 client.chicago.example.com s= c=IN IP4 client.chicago.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F21 200 OK Alice -> Carol SIP/2.0 200 OK Via: SIP/2.0/TLS client.chicago.example.com:5061 ;branch=z9hG4bK74bQ2 ;received=192.0.2.105 From: Carol <sips:carol@chicago.example.com>;tag=5893461 To: Alice <sips:alice@atlanta.example.com>;tag=222 Call-ID: 6485356@chicago.example.com CSeq: 1 INVITE Contact: <sips:a8342043f@atlanta.example.com;gr> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces, gruu Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844527 2890844527 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F22 ACK Carol -> Alice ACK sips:a8342043f@atlanta.example.com;gr SIP/2.0 Via: SIP/2.0/TLS client.chicago.example.com:5061 ;branch=z9hG4bK74bJ0 Max-Forwards: 70 From: Carol <sips:carol@chicago.example.com>;tag=5893461 To: Alice <sips:alice@atlanta.example.com>;tag=222 Call-ID: 6485356@chicago.example.com CSeq: 1 ACK Content-Length: 0 /* A replaces the session to the Park Server with the new session with C and generates a BYE to disconnect the Park Server. */ Johnston, et al. Best Current Practice [Page 145]
RFC 5359 SIP Service Examples October 2008 F23 BYE Alice -> Park Server BYE sips:park@server.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74b4N Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=098594 To: <sips:park@server.example.com>;tag=0111 Call-ID: a5-75-34-12-76@server.example.com CSeq: 1 BYE Content-Length: 0 F24 200 OK Park Server -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74b4N ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=098594 To: <sips:park@server.example.com>;tag=0111 Call-ID: a5-75-34-12-76@server.example.com CSeq: 1 BYE Content-Length: 0 Johnston, et al. Best Current Practice [Page 146]
RFC 5359 SIP Service Examples October 2008 2.16. Call Pickup Alice Bob Bill | | | | INVITE F1 | | |------------->| | |180 Ringing F2| | |<-------------| | | | SUBSCRIBE F3 | | |<------------------| | | 200 OK F4 | | |------------------>| | | NOTIFY F5 | | |------------------>| | | 200 OK F6 | | |<------------------| | INVITE Replaces:Bob F7 | |<---------------------------------| | | 200 OK F8 | |--------------------------------->| | CANCEL F9 | | |------------->| | | 200 OK F10 | | |<-------------| | | 487 F11 | | |<-------------| | | ACK F12 | | |------------->| | | ACK F13 | |<---------------------------------| | | | Two-Way RTP Established | |<================================>| | BYE F14 | |--------------------------------->| | 200 OK F15 | |<---------------------------------| | | Bob and Bill are part of a work group at example.com that can pick up each other's calls. Alice calls Bob, who does not answer. Bill wishes to pick up the call and sends a SUBSCRIBE to Bob to retrieve the dialog information. Bill then generates an INVITE with a Replaces to Alice. Alice answers the INVITE and sends a CANCEL to stop Bob's phone ringing. Note that the relative order of the 487/ACK sequence (F11/F12) and the 200 OK to the CANCEL (F10) is not deterministic. Johnston, et al. Best Current Practice [Page 147]
RFC 5359 SIP Service Examples October 2008 This call flow shows the use of the "early-only" parameter [RFC3891] in the Replaces header field of F7. This parameter prevents Alice from accepting the INVITE if Bob has already accepted the INVITE. If Bill had wished to "take" the call from Bob regardless of whether he had answered, the parameter would not have been present in F7. Also note that the subscription between Bob and Carol could have been established prior to Alice's call. Message Details F1 INVITE Alice -> Bob INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:a8342043f@atlanta.example.com;gr> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces, gruu Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 180 Ringing Bob -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=3145678 Call-ID: 12345600@atlanta.example.com Johnston, et al. Best Current Practice [Page 148]
RFC 5359 SIP Service Examples October 2008 CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Content-Length: 0 /* Bill decides to pick up the call. */ F3 SUBSCRIBE Bill -> Bob SUBSCRIBE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS pc.biloxi.example.com:5061 ;branch=z9hG4bK74bf Max-Forwards: 70 From: Bill <sips:bill@biloxi.example.com>;tag=8675309 To: Bob <sips:bob@biloxi.example.com> Call-ID: rt4353gs2egg@pc.biloxi.example.com CSeq: 1 SUBSCRIBE Contact: <sips:bill@pc.biloxi.example.com> Event: dialog Expires: 0 Accept: application/dialog-info+xml Content-Length: 0 F4 200 OK Bob -> Bill SIP/2.0 200 OK Via: SIP/2.0/TLS pc.biloxi.example.com:5061 ;branch=z9hG4bK74bf ;received=192.0.2.114 Max-Forwards: 70 From: Bill <sips:bill@biloxi.example.com>;tag=8675309 To: Bob <sips:bob@biloxi.example.com>;tag=31451098 Call-ID: rt4353gs2egg@pc.biloxi.example.com CSeq: 1 SUBSCRIBE Content-Length: 0 F5 NOTIFY Bob -> Bill NOTIFY sips:bill@pc.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bK74br Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=31451098 To: Bill <sips:bill@biloxi.example.com>;tag=8675309 Call-ID: rt4353gs2egg@pc.biloxi.example.com CSeq: 1 NOTIFY Johnston, et al. Best Current Practice [Page 149]
RFC 5359 SIP Service Examples October 2008 Contact: <sips:bob@client.biloxi.example.com> Event: dialog Subscription-State: terminated;reason=timeout Content-Type: application/dialog-info+xml Content-Length: ... <?xml version="1.0"?> <dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="0" state="full" entity="sips:bob@biloxi.example.com"> <dialog id="94992014524" call-id="12345600@atlanta.example.com" local-tag="3145678" remote-tag="1234567" direction="recipient"> <duration>1</duration> <local> <identity display="Bob">sips:bob@biloxi.example.com</identity> <target>sips:bob@client.biloxi.example.com</target> </local> <remote> <identity display="Alice">sips:alice@atlanta.example.com </identity> <target>sips:a8342043@atlanta.example.com;gr</target> </remote> <state>early</state> </dialog> </dialog-info> F6 200 OK Bill -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bK74br ;received=192.0.2.105 From: Bob <sips:bob@biloxi.example.com>;tag=31451098 To: Bill <sips:bill@biloxi.example.com>;tag=8675309 Call-ID: rt4353gs2egg@pc.biloxi.example.com CSeq: 1 NOTIFY Contact: <sips:bill@pc.biloxi.example.com> Content-Length: 0 F7 INVITE Bill -> Alice INVITE sips:a8342043f@atlanta.example.com;gr SIP/2.0 Via: SIP/2.0/TLS pc.biloxi.example.com:5061 ;branch=z9hG4bK74HH Max-Forwards: 70 From: Bill <sips:bill@biloxi.example.com>;tag=8675310 To: Alice <sips:alice@atlanta.example.com> Johnston, et al. Best Current Practice [Page 150]
RFC 5359 SIP Service Examples October 2008 Call-ID: 563456212@b2.biloxi.example.com CSeq: 1 INVITE Require: replaces Replaces: 12345600@atlanta.example.com ;from-tag=314578;to-tag=1234567;early-only Contact: <sips:bill@pc.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bill 2890843122 2890843122 IN IP4 pc.biloxi.example.com s= c=IN IP4 pc.biloxi.example.com t=0 0 m=audio 5342 RTP/AVP 0 a=rtpmap:0 PCMU/8000 /* Alice matches the dialog information in the Replaces header and accepts the INVITE. */ F8 200 OK Alice -> Bill SIP/2.0 200 OK Via: SIP/2.0/TLS pc.biloxi.example.com:5061 ;branch=z9hG4bK74HH ;received=192.0.2.114 From: Bill <sips:bill@biloxi.example.com>;tag=8675310 To: Alice <sips:alice@atlanta.example.com>;tag=131256 Call-ID: 563456212@b2.biloxi.example.com CSeq: 1 INVITE Contact: <sips:a8342043f@atlanta.example.com;gr> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces, gruu Content-Type: application/sdp Content-Length: ... v=0 o=alice 289084543 289084543 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49172 RTP/AVP 0 a=rtpmap:0 PCMU/8000 /* Alice stops Bob's phone from ringing by sending a CANCEL. */ Johnston, et al. Best Current Practice [Page 151]
RFC 5359 SIP Service Examples October 2008 F9 CANCEL Alice -> Bob CANCEL sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 CANCEL Content-Length: 0 F10 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=3145678 Call-ID: 12345600@atlanta.example.com CSeq: 1 CANCEL Content-Length: 0 F11 487 Request Terminated Bob -> Alice SIP/2.0 487 Request Terminated Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=3145678 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 F12 ACK Alice -> Bob ACK sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK83749.1 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=3145678 Johnston, et al. Best Current Practice [Page 152]
RFC 5359 SIP Service Examples October 2008 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 F13 ACK Bill -> Alice ACK sips:a8342043f@atlanta.example.com;gr SIP/2.0 Via: SIP/2.0/TLS pc.biloxi.example.com:5061 ;branch=z9hG4bK7435 Max-Forwards: 70 From: Bill <sips:bill@biloxi.example.com>;tag=8675310 To: Alice <sips:alice@atlanta.example.com>;tag=131256 Call-ID: 563456212@b2.biloxi.example.com CSeq: 1 ACK Content-Length: 0 /* RTP streams are established between Alice and Bill. Later, Alice hangs up with Bill. */ F14 BYE Alice -> Bill BYE sips:bill@pc.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf2 Max-Forwards: 70 To: Bill <sips:bill@biloxi.example.com>;tag=8675310 From: Alice <sips:alice@atlanta.example.com>;tag=131256 Call-ID: 563456212@b2.biloxi.example.com CSeq: 1 BYE Content-Length: 0 F15 200 OK Bill -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf2 ;received=192.0.2.105 To: Bill <sips:bill@biloxi.example.com>;tag=8675310 From: Alice <sips:alice@atlanta.example.com>;tag=131256 Call-ID: 563456212@b2.biloxi.example.com CSeq: 1 BYE Content-Length: 0 Johnston, et al. Best Current Practice [Page 153]
RFC 5359 SIP Service Examples October 2008 2.17. Automatic Redial Alice Bob | | | INVITE F1 | |--------------->| |486 Busy Here F2| |<---------------| Bob is busy | ACK F3 | |--------------->| | SUBSCRIBE F4 | |--------------->| | 200 OK F5 | |<---------------| | NOTIFY F6 | |<---------------| | 200 OK F7 | |--------------->| | | | NOTIFY F8 | Bob is now available |<---------------| | 200 OK F9 | |--------------->| | | | INVITE F10 | |--------------->| Session setup successful | 180 Ringing F11| |<---------------| | 200 OK F12 | |<---------------| | ACK F13 | |--------------->| | Media Session | |<==============>| | | | NOTIFY F14 | |<---------------| | 200 OK F15 | |--------------->| | | | SUBSCRIBE F16 | Alice terminates subscription |--------------->| | 200 OK F17 | |<---------------| | NOTIFY F18 | |<---------------| | 200 OK F19 | |--------------->| | | Johnston, et al. Best Current Practice [Page 154]
RFC 5359 SIP Service Examples October 2008 Bob is initially busy when Alice calls. Alice subscribes to Bob's call state using a SUBSCRIBE F4. Bob sends a NOTIFY F8 when Bob is available. Alice is alerted, then Alice sends an INVITE to Bob to establish the session. The subscription is terminated using SUBSCRIBE F16. Message Details F1 INVITE Alice -> Bob INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F2 486 Busy Here SIP/2.0 486 Busy Here Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=982039i4 Call-ID: 12345600@atlanta.example.com CSeq: 1 INVITE Content-Length: 0 Johnston, et al. Best Current Practice [Page 155]
RFC 5359 SIP Service Examples October 2008 F3 ACK Alice -> Bob ACK sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=982039i4 Call-ID: 12345600@atlanta.example.com CSeq: 1 ACK Content-Length: 0 F4 SUBSCRIBE Alice -> Bob SUBSCRIBE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74b8G Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=837348234 To: Bob <sips:bob@biloxi.example.com> Call-ID: 4524526232@atlanta.example.com CSeq: 1 SUBSCRIBE Contact: sips:alice@client.atlanta.example.com Event: dialog Accept: application/dialog-info+xml Content-Length: 0 F5 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74b8G ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=837348234 To: Bob <sips:bob@biloxi.example.com>;tag=341123 Call-ID: 4524526232@atlanta.example.com Expires: 60 CSeq: 1 SUBSCRIBE Contact: sips:bob@client.biloxi.example.com Content-Length: 0 Johnston, et al. Best Current Practice [Page 156]
RFC 5359 SIP Service Examples October 2008 F6 NOTIFY Bob -> Alice NOTIFY sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bK74bn2 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=341123 To: Alice <sips:alice@atlanta.example.com>;tag=837348234 Call-ID: 4524526232@atlanta.example.com CSeq: 1 NOTIFY Contact: <sips:bob@client.biloxi.example.com> Event: dialog Subscription-State: active;expires=59 Content-Type: application/dialog-info+xml Content-Length: ... <?xml version="1.0"?> <dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="0" state="full" entity="sips:bob@biloxi.example.com"> <dialog id="562623442g3"> <duration>1</duration> <state>confirmed</state> </dialog> </dialog-info> F7 200 OK Alice -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bK74bn2 ;received=192.0.2.105 From: Bob <sips:bob@biloxi.example.com>;tag=341123 To: Alice <sips:alice@atlanta.example.com>;tag=837348234 Call-ID: 4524526232@atlanta.example.com CSeq: 1 NOTIFY Content-Length: 0 /* Bob is now available. */ F8 NOTIFY Bob -> Alice NOTIFY sips:alice@atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bK74bVi Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=341123 Johnston, et al. Best Current Practice [Page 157]
RFC 5359 SIP Service Examples October 2008 To: Alice <sips:alice@atlanta.example.com>;tag=837348234 Call-ID: 4524526232@atlanta.example.com CSeq: 2 NOTIFY Event: dialog Subscription-State: active;expires=27 Contact: <sips:bob@client.biloxi.example.com> Content-Type: application/dialog-info+xml Content-Length: ... <?xml version="1.0"?> <dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="0" state="full" entity="sips:bob@biloxi.example.com"> <dialog id="562623442g3"> <state>terminated</state> </dialog> </dialog-info> F9 200 OK Alice -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bK74bVi ;received=192.0.2.105 From: Bob <sips:bob@biloxi.example.com>;tag=341123 To: Alice <sips:alice@atlanta.example.com>;tag=837348234 Call-ID: 4524526232@atlanta.example.com CSeq: 2 NOTIFY Content-Length: 0 F10 INVITE Alice -> Bob INVITE sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfq Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=f23fkg14k To: Bob <sips:bob@biloxi.example.com> Call-ID: aoij4i9okitr@atlanta.example.com CSeq: 1 INVITE Contact: <sips:alice@client.atlanta.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... Johnston, et al. Best Current Practice [Page 158]
RFC 5359 SIP Service Examples October 2008 v=0 o=alice 2890844826 2890844826 IN IP4 client.atlanta.example.com s= c=IN IP4 client.atlanta.example.com t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F11 180 Ringing Bob -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfq ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=f23fkg14k To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: aoij4i9okitr@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Content-Length: 0 F12 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bfq ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=f23fkg14k To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: aoij4i9okitr@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890854527 2890854527 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 Johnston, et al. Best Current Practice [Page 159]
RFC 5359 SIP Service Examples October 2008 F13 ACK Alice -> Bob ACK sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK74bLBJ Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=f23fkg14k To: Bob <sips:bob@biloxi.example.com>;tag=23431 Call-ID: aoij4i9okitr@atlanta.example.com CSeq: 1 ACK Content-Length: 0 F14 NOTIFY Bob -> Alice NOTIFY sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bK4bnd2 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=341123 To: Alice <sips:alice@atlanta.example.com>;tag=837348234 Call-ID: 4524526232@atlanta.example.com CSeq: 3 NOTIFY Contact: <sips:bob@client.biloxi.example.com> Event: dialog Subscription-State: active;expires=15 Content-Type: application/dialog-info+xml Content-Length: ... <?xml version="1.0"?> <dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="0" state="full" entity="sips:bob@biloxi.example.com"> <dialog id="62d2623442g3"> <duration>1</duration> <state>confirmed</state> </dialog> </dialog-info> F15 200 OK Alice -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bK4bnd2 ;received=192.0.2.105 From: Bob <sips:bob@biloxi.example.com>;tag=341123 To: Alice <sips:alice@atlanta.example.com>;tag=837348234 Johnston, et al. Best Current Practice [Page 160]
RFC 5359 SIP Service Examples October 2008 Call-ID: 4524526232@atlanta.example.com CSeq: 3 NOTIFY Content-Length: 0 /* Alice terminates the subscription. */ F16 SUBSCRIBE Alice -> Bob SUBSCRIBE sips:bob@client.biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK474b8 Max-Forwards: 70 From: Alice <sips:alice@atlanta.example.com>;tag=837348234 To: Alice <sips:alice@atlanta.example.com>;tag=837348234 Call-ID: 4524526232@atlanta.example.com CSeq: 2 SUBSCRIBE Contact: sips:alice@client.atlanta.example.com Event: dialog Expires: 0 Accept: application/dialog-info+xml Content-Length: 0 F17 200 OK Bob -> Alice SIP/2.0 200 OK Via: SIP/2.0/TLS client.atlanta.example.com:5061 ;branch=z9hG4bK474b8 ;received=192.0.2.103 From: Alice <sips:alice@atlanta.example.com>;tag=837348234 To: Bob <sips:bob@biloxi.example.com>;tag=341123 Call-ID: 4524526232@atlanta.example.com Expires: 0 CSeq: 2 SUBSCRIBE Contact: sips:bob@client.biloxi.example.com Content-Length: 0 F18 NOTIFY Bob -> Alice NOTIFY sips:alice@client.atlanta.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKb5n2j Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=341123 To: Alice <sips:alice@atlanta.example.com>;tag=837348234 Call-ID: 4524526232@atlanta.example.com Johnston, et al. Best Current Practice [Page 161]
RFC 5359 SIP Service Examples October 2008 CSeq: 4 NOTIFY Contact: <sips:bob@client.biloxi.example.com> Event: dialog Subscription-State: terminated;reason=noresource Content-Type: application/dialog-info+xml Content-Length: ... <?xml version="1.0"?> <dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="0" state="full" entity="sips:bob@biloxi.example.com"> <dialog id="62d2623442g3"> <duration>3</duration> <state>confirmed</state> </dialog> </dialog-info> F19 200 OK Alice -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKb5n2j ;received=192.0.2.105 From: Bob <sips:bob@biloxi.example.com>;tag=341123 To: Alice <sips:alice@atlanta.example.com>;tag=837348234 Call-ID: 4524526232@atlanta.example.com CSeq: 4 NOTIFY Content-Length: 0 Johnston, et al. Best Current Practice [Page 162]
RFC 5359 SIP Service Examples October 2008 2.18. Click to Dial Bob's PC Bob Carol | REFER Refer-To:Carol F1 | |------------------->| | | 202 Accepted F2 | | |<-------------------| | | | INVITE F3 | | |------------------->| | | 180 Ringing F4 | | |<-------------------| | | 200 OK F5 | | |<-------------------| | | ACK F6 | | |------------------->| | | RTP | | |<==================>| | | | In this example, while browsing the web on his PC, Bob clicks on Carol's SIP URI, intending to establish a session with Carol. Bob's web browser passes the SIP URI to the SIP client on Bob's PC. The PC client is configured with the URI of Bob's SIP phone. A REFER is sent to the SIP phone, which results in the establishment of the session between Bob and Carol. Note that Bob's PC requests that no REFER dialog be established by the use of the Refer-Sub: false header field [RFC4488]. This flow is preferable to the 3pcc flow because the end-to-end SIP signaling is not interrupted by the 3pcc controller, and because Bob's experience of the call will not be marred by the lack of ringback tone or possible clipping. Suitable authorization of the REFER and explicit authorization of the triggered INVITE by Bob are necessary. Message Details /* Bob's PC SIP client sends a REFER to Bob's SIP phone. */ F1 REFER PC -> Bob REFER sips:bob@biloxi.example.com SIP/2.0 Via: SIP/2.0/TLS pc.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 Max-Forwards: 70 From: <sips:pc.biloxi.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com> Johnston, et al. Best Current Practice [Page 163]
RFC 5359 SIP Service Examples October 2008 Call-ID: 1234560183434 CSeq: 1 REFER Refer-To: <sips:carol@chicago.example.com> Refer-Sub: false Contact: <sips:pc.biloxi.example.com> Content-Length: 0 F2 202 Accepted Bob -> PC SIP/2.0 202 Accepted Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashds7 ;received=192.0.2.103 From: <sips:pc.biloxi.example.com>;tag=1234567 To: Bob <sips:bob@biloxi.example.com>;tag=314159 Call-ID: 1234560183434 Contact: <sips:bob@client.biloxi.example.com> CSeq: 1 REFER Refer-Sub: false Content-Length: 0 F3 INVITE Bob -> Carol INVITE sips:carol@chicago.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashdK9 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com> Call-ID: 7436222@atlanta.example.com CSeq: 1 INVITE Contact: <sips:bob@client.biloxi.example.com> Referred-By: <sips:pc.biloxi.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=bob 2890844539 2890844539 IN IP4 client.biloxi.example.com s= c=IN IP4 client.biloxi.example.com t=0 0 m=audio 3458 RTP/AVP 0 a=rtpmap:0 PCMU/8000 Johnston, et al. Best Current Practice [Page 164]
RFC 5359 SIP Service Examples October 2008 F4 180 Ringing Carol -> Bob SIP/2.0 180 Ringing Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashdK9 ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=928287 Call-ID: 7436222@atlanta.example.com CSeq: 1 INVITE Contact: <sips:carol@client.chicago.example.com> Content-Length: 0 F5 200 OK Carol -> Bob SIP/2.0 200 OK Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashdK9 ;received=192.0.2.113 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=928287 Call-ID: 7436222@atlanta.example.com CSeq: 1 INVITE Contact: <sips:carol@client.chicago.example.com> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY Supported: replaces Content-Type: application/sdp Content-Length: ... v=0 o=carol 2890844527 2890844527 IN IP4 client.chicago.example.com s= c=IN IP4 client.chicago.example.com t=0 0 m=audio 3456 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F6 ACK Bob -> Carol ACK sips:carol@client.chicago.example.com SIP/2.0 Via: SIP/2.0/TLS client.biloxi.example.com:5061 ;branch=z9hG4bKnashd43 Max-Forwards: 70 From: Bob <sips:bob@biloxi.example.com>;tag=8675309 To: Carol <sips:carol@chicago.example.com>;tag=928287 Johnston, et al. Best Current Practice [Page 165]
RFC 5359 SIP Service Examples October 2008 Call-ID: 7436222@atlanta.example.com CSeq: 1 ACK Content-Length: 0 /* Bob and Carol now have established a session. */ 3. Security Considerations Since many of the examples in this document involve SIP call control, either peer-to-peer or 3pcc, the security considerations in the Multiparty Framework document [FRAMEWORK] apply. Many of the services shown in this document rely on a particular user agent being part of a group. Members of a group could be, for example, employees within a particular department, a set of home phone extensions, members of a call center, etc. As such, user agents that are part of the group permit other group members special privileges and features. For example, while a user agent may not in general allow another user agent to learn detailed dialog information, this information might be shared with another group member in order to facilitate a service such as call pickup. Group members must be authenticated using normal SIP means such as certificates or shared secrets. The service examples in this document make extensive use of the SIP call control primitives REFER, Replaces, Join, and the dialog package. The security considerations associated with each of these extensions [RFC3515], [RFC3891], [RFC3911], [RFC4235] apply to the scenarios in this document. 4. Acknowledgements The authors would like to thank the following reviewers of the document for their detailed comments and corrections: Vijay Gurbani, John Elwell, Joel Repiquet, Nagesh Kumar, Chandra Ravipati, Eric Burger, Jeroen Bemmel, Miguel Garcia, and Dale Worley. The Transfer - Instant Messaging call flow is based on the "IM-a- call" call flow by Jonathan Rosenberg and Henning Schulzrinne. The Automatic Redial call flow is based on a call flow by Adam Roach. The authors wish to thank the following individuals for their assistance and review of this call flows document: Joel Repiquet, Aki Neimi, Rohan Mahy, Jonathan Rosenberg, Hemant Agrawal, Henry Sinnreich, Dean Willis, David Devanatham, Joe Pizzimenti, Matt Cannon, John Hearty, the whole MCI WorldCom IPOP Design team, Scott Johnston, et al. Best Current Practice [Page 166]
RFC 5359 SIP Service Examples October 2008 Orton, Greg Osterhout, Pat Sollee, Doug Weisenberg, Danny Mistry, Steve McKinnon, and Denise Ingram, Denise Caballero, Tom Redman, Ilya Slain, Pat Sollee, John Truetken, and others from MCI WorldCom, 3Com, Cisco, Lucent, and Nortel. 5. References 5.1. Normative References [RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A., Peterson, J., Sparks, R., Handley, M., and E. Schooler, "SIP: Session Initiation Protocol", RFC 3261, June 2002. [RFC3264] Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model with Session Description Protocol (SDP)", RFC 3264, June 2002. [RFC3265] Roach, A., "Session Initiation Protocol (SIP)-Specific Event Notification", RFC 3265, June 2002. [RFC3428] Campbell, B., Rosenberg, J., Schulzrinne, H., Huitema, C., and D. Gurle, "Session Initiation Protocol (SIP) Extension for Instant Messaging", RFC 3428, December 2002. [RFC3515] Sparks, R., "The Session Initiation Protocol (SIP) Refer Method", RFC 3515, April 2003. [RFC3840] Rosenberg, J., Schulzrinne, H., and P. Kyzivat, "Indicating User Agent Capabilities in the Session Initiation Protocol (SIP)", RFC 3840, August 2004. [RFC3891] Mahy, R., Biggs, B., and R. Dean, "The Session Initiation Protocol (SIP) "Replaces" Header", RFC 3891, September 2004. [RFC3911] Mahy, R. and D. Petrie, "The Session Initiation Protocol (SIP) "Join" Header", RFC 3911, October 2004. [RFC4235] Rosenberg, J., Schulzrinne, H., and R. Mahy, "An INVITE- Initiated Dialog Event Package for the Session Initiation Protocol (SIP)", RFC 4235, November 2005. [RFC4488] Levin, O., "Suppression of Session Initiation Protocol (SIP) REFER Method Implicit Subscription", RFC 4488, May 2006. Johnston, et al. Best Current Practice [Page 167]
RFC 5359 SIP Service Examples October 2008 [RFC4579] Johnston, A. and O. Levin, "Session Initiation Protocol (SIP) Call Control - Conferencing for User Agents", BCP 119, RFC 4579, August 2006. 5.2. Informative References [FRAMEWORK] Mahy, R., Sparks, R., Rosenberg, J., Petrie, D., and A. Johnston, "A Call Control and Multi-party usage framework for the Session Initiation Protocol (SIP)", Work in Progress, April 2008. [GRUU] Rosenberg, J., "Obtaining and Using Globally Routable User Agent (UA) URIs (GRUU) in the Session Initiation Protocol (SIP)", Work in Progress, October 2007. [RFC3665] Johnston, A., Donovan, S., Sparks, R., Cunningham, C., and K. Summers, "Session Initiation Protocol (SIP) Basic Call Flow Examples", BCP 75, RFC 3665, December 2003. [RFC3725] Rosenberg, J., Peterson, J., Schulzrinne, H., and G. Camarillo, "Best Current Practices for Third Party Call Control (3pcc) in the Session Initiation Protocol (SIP)", BCP 85, RFC 3725, April 2004. [RFC4317] Johnston, A. and R. Sparks, "Session Description Protocol (SDP) Offer/Answer Examples", RFC 4317, December 2005. [RFC4475] Sparks, R., Hawrylyshen, A., Johnston, A., Rosenberg, J., and H. Schulzrinne, "Session Initiation Protocol (SIP) Torture Test Messages", RFC 4475, May 2006. [TRANSFER] Sparks, R. and A. Johnston, "Session Initiation Protocol Call Control - Transfer", Work in Progress, September 2008. Johnston, et al. Best Current Practice [Page 168]
RFC 5359 SIP Service Examples October 2008 Authors' Addresses Alan Johnston (editor) Avaya St. Louis, MO 63124 EMail: alan@sipstation.com Robert J. Sparks Tekelec EMail: RjS@nostrum.com Chris Cunningham Cisco Systems EMail: chrcunni@cisco.com Steve Donovan Cisco Systems EMail: srd@cisco.com Kevin Summers Sonus Plano, TX 75093 EMail: ksummers@sonusnet.com Johnston, et al. Best Current Practice [Page 169]
RFC 5359 SIP Service Examples October 2008 Full Copyright Statement Copyright (C) The IETF Trust (2008). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Intellectual Property The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Johnston, et al. Best Current Practice [Page 170]