SIP Callflow Examples Written by Hemanshu Patel    Thursday, 08 November 2007 Article Index SIP Callflow Examples Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 14 of 17 3.8. Unsuccessful No Answer Alice Proxy 1 Proxy 2 Bob | | | | | INVITE F1 | | | |--------------->| INVITE F2 | | | 100 F3 |--------------->| INVITE F4 | |<---------------| 100 F5 |--------------->| | |<---------------| | | | | 180 F6 | | | 180 F7 |<---------------| | 180 F8 |<---------------| | |<---------------| | | | CANCEL F9 | | | |--------------->| | | | 200 F10 | | | |<---------------| CANCEL F11 | | | |--------------->| | | | 200 F12 | | | |<---------------| | | | | CANCEL F13 | | | |--------------->| | | | 200 F14 | | | |<---------------| | | | 487 F15 | | | |<---------------| | | | ACK F16 | | | 487 F17 |--------------->| | |<---------------| | | | ACK F18 | | | 487 F19 |--------------->| | |<---------------| | | | ACK F20 | | | |--------------->| | | | | | | In this scenario, Alice gives up on the call before Bob answers (sends a 200 OK response). Alice sends a CANCEL (F9) since no final response had been received from Bob. If a 200 OK to the INVITE had crossed with the CANCEL, Alice would have sent an ACK then a BYE to Bob in order to properly terminate the call. Note that the CANCEL message is acknowledged with a 200 OK on a hop by hop basis, rather than end to end. Message Details F1 INVITE Alice -> Proxy 1 INVITE sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0 Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9 Max-Forwards: 70 Route: <sip:ss1.atlanta.example.com;lr> From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 INVITE Contact: <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Proxy-Authorization: Digest username="alice", realm="atlanta.example.com", nonce="ze7k1ee88df84f1cec431ae6cbe5a359", opaque="", uri="sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it ", response="b00b416324679d7e243f55708d44be7b" Content-Type: application/sdp Content-Length: 151 v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s=- c=IN IP4 192.0.2.101 t=0 0 m=audio 49172 RTP/AVP 0 a=rtpmap:0 PCMU/8000 /*Client for Alice prepares to receive data on port 49172 from the network.*/ F2 INVITE Proxy 1 -> Proxy 2 INVITE sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0 Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1 Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9 ;received=192.0.2.101 Max-Forwards: 69 Record-Route: <sip:ss1.atlanta.example.com;lr> From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 INVITE Contact: <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Content-Type: application/sdp Content-Length: 151 v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s=- c=IN IP4 192.0.2.101 t=0 0 m=audio 49172 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F3 100 Trying Proxy 1 -> Alice SIP/2.0 100 Trying Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9 ;received=192.0.2.101 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 INVITE Content-Length: 0 F4 INVITE Proxy 2 -> Bob INVITE sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0 Via: SIP/2.0/UDP ss2.biloxi.example.com:5060;branch=z9hG4bK721e4.1 Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1 ;received=192.0.2.111 Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9 ;received=192.0.2.101 Record-Route: <sip:ss2.biloxi.example.com;lr>, <sip:ss1.atlanta.example.com;lr> Max-Forwards: 68 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 INVITE Contact: <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Content-Type: application/sdp Content-Length: 151 v=0 o=alice 2890844526 2890844526 IN IP4 client.atlanta.example.com s=- c=IN IP4 192.0.2.101 t=0 0 m=audio 49172 RTP/AVP 0 a=rtpmap:0 PCMU/8000 F5 100 Trying Proxy 2 -> Proxy 1 SIP/2.0 100 Trying Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1 ;received=192.0.2.111 Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9 ;received=192.0.2.101 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 INVITE Content-Length: 0 F6 180 Ringing Bob -> Proxy 2 SIP/2.0 180 Ringing Via: SIP/2.0/UDP ss2.biloxi.example.com:5060;branch=z9hG4bK721e4.1 ;received=192.0.2.222 Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1 ;received=192.0.2.111 Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9 ;received=192.0.2.101 Record-Route: <sip:ss2.biloxi.example.com;lr>, <sip:ss1.atlanta.example.com;lr> From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159 Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 INVITE Contact: <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Content-Length: 0 F7 180 Ringing Proxy 2 -> Proxy 1 SIP/2.0 180 Ringing Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1 ;received=192.0.2.111 Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9 ;received=192.0.2.101 Record-Route: <sip:ss2.biloxi.example.com;lr>, <sip:ss1.atlanta.example.com;lr> From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159 Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 INVITE Contact: <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Content-Length: 0 F8 180 Ringing Proxy 1 -> Alice SIP/2.0 180 Ringing Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9 ;received=192.0.2.101 Record-Route: <sip:ss2.biloxi.example.com;lr>, <sip:ss1.atlanta.example.com;lr> From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159 Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 INVITE Contact: <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Content-Length: 0 F9 CANCEL Alice -> Proxy 1 CANCEL sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0 Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Route: <sip:ss1.atlanta.example.com;lr> Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 CANCEL Content-Length: 0 F10 200 OK Proxy 1 -> Alice SIP/2.0 200 OK Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9 ;received=192.0.2.101 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 CANCEL Content-Length: 0 F11 CANCEL Proxy 1 -> Proxy 2 CANCEL sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0 Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1 Max-Forwards: 70 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 CANCEL Content-Length: 0 F12 200 OK Proxy 2 -> Proxy 1 SIP/2.0 200 OK Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1 ;received=192.0.2.111 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 CANCEL Content-Length: 0 F13 CANCEL Proxy 2 -> Bob CANCEL sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0 Via: SIP/2.0/UDP ss2.biloxi.example.com:5060;branch=z9hG4bK721e4.1 Max-Forwards: 70 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 CANCEL Content-Length: 0 F14 200 OK Bob -> Proxy 2 SIP/2.0 200 OK Via: SIP/2.0/UDP ss2.biloxi.example.com:5060;branch=z9hG4bK721e4.1 ;received=192.0.2.222 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it > Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 CANCEL Content-Length: 0 F15 487 Request Terminated Bob -> Proxy 2 SIP/2.0 487 Request Terminated Via: SIP/2.0/UDP ss2.biloxi.example.com:5060;branch=z9hG4bK721e4.1 ;received=192.0.2.222 Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1 ;received=192.0.2.111 Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9 ;received=192.0.2.101 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159 Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 INVITE Content-Length: 0 F16 ACK Proxy 2 -> Bob ACK sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0 Via: SIP/2.0/UDP ss2.biloxi.example.com:5060;branch=z9hG4bK721e4.1 Max-Forwards: 70 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159 Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 ACK Content-Length: 0 F17 487 Request Terminated Proxy 2 -> Proxy 1 SIP/2.0 487 Request Terminated Via: SIP/2.0/UDP ss1.atlanta.example.com:5060;branch=z9hG4bK2d4790.1 ;received=192.0.2.111 Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9 ;received=192.0.2.101 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159 Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 INVITE Content-Length: 0 F18 ACK Proxy 1 -> Proxy 2 ACK sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0 Via: SIP/2.0/UDP ss2.biloxi.example.com:5060;branch=z9hG4bK721e4.1 Max-Forwards: 70 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159 Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 ACK Content-Length: 0 F19 487 Request Terminated Proxy 1 -> Alice SIP/2.0 487 Request Terminated Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9 ;received=192.0.2.101 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159 Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it CSeq: 1 INVITE F20 ACK Alice -> Proxy 1 ACK sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it SIP/2.0 Via: SIP/2.0/UDP client.atlanta.example.com:5060;branch=z9hG4bK74bf9 Max-Forwards: 70 From: Alice <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=9fxced76sl To: Bob <sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it >;tag=314159 Call-ID: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it Proxy-Authorization: Digest username="alice", realm="atlanta.example.com", nonce="ze7k1ee88df84f1cec431ae6cbe5a359", opaque="", uri="sip: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it ", response="b00b416324679d7e243f55708d44be7b" CSeq: 1 ACK Content-Length: 0 << Prev - Next >>   < Prev   Next > [ Back ]

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