de:5060;branch=z9hG4bK83842.1 received=100.101.102.105 Via: SIP/2.0/UDP 100.101.102.103:5060;branch=z9hG4bKmp17a To: Heisenberg7 ip:werner.heisenberg@munich.de>;tag=314159 From: E. Schroedinger <sip:schroed5244@aol.com>;tag=42 Call-ID: 10@100.101.102.103 CSeq: 1 INVITE Contact: sip:werner.heisenberg@200.201.202.203> Content-Type: application/sdp Content-Length: 159 o=heisenberg 2890844526 2890844526 IN IP4 200.201.202.203 s=Phone Call C=IN IP4 200.201.202.203 t=0 0 m=audio 49172 RTP/AVP 0 a=rtpmap: 0 PCMU/8000 SIP/2.0 200 OK Via: SIP/2.0/UDP 100.101.102.103:5060;branch=z9hG4bKmp17a To: Heisenberg <sip:werner.heisenberg@munich.de>;tag=314159 From: E. Schroedinger <sip:schroed5244@aol.com>;tag=42 Call-ID: 10@100.101.102.103 CSeq: 1 INVITE Contact: sip:werner.heisenberg@200.201.202.203 Content-Type: application/sdp Content-Length: 159 o=heisenberg 2890844526 2890844526 IN IP4 200.201.202.203 C=IN IP4 200.201.202.203 t=0 0 m=audio 49170 RTP/AVP 0 a=rtpmap: 0 PCMU/8000 ACK ip:werner.heisenberg@200.201.202.20 SIP/2.0 SIP: Understanding the Session Initiation Protocol Via: SIP/2.0/UDP 100.101.102.103:5060;branch=z9hG4bkka42 Max-Forwards: 70 To: Heisenberg sip:werner.heisenberg@munich.de>;tag=314159 From: E. Schroedinger <sip:schroed5244@aol.com>;tag=42 Call-ID: 10@100.101.102.103 CSeq: 1 ACK Content-Length: 0 BYE sip:schroed5244@pc33.aol.com SIP/2.0 Via: SIP/2.0/UDP 200.201.202.203:5060;branch=z9hG4bK4332 Max-Forwards: 70 To: E. Schroedinger <sip:schroed5244@aol.com>;tag= From: Heisenberg <sip:werner.heisenberg@munich.de>;tag=314159 Call-ID: 10@100.101.102.103 CSeq: 2000 BYE Content-Length: 0 SIP/2.0 200 OK Via: SIP/2.0/UDP 00.201.202.203:5060;branch=z9hG4bK4332 To: E. Schroedinger <sip:schroed5244@aol.com>;tag=42 From: Heisenberg <sip:werner.heisenberg@munich.de>;tag=314159 Call-ID: 10@100.101.102.103 CSeq: 2000 BYE Content-Length: 0 10.9 SIP Presence and Instant Message Example This section contains the call flow details of Figure 2.4. SUBSCRIBE sip:poisson@probability.org SIP/2.0 Via SIP/2.0/TCP Lecturehall21.academy