 MESSSAGE, REFER, UPDATE Content-Type: application/sdp Content-Length: O=- 2890844526 2890844527 IN IP6 [::0000:1111:2222:3333] s=Phone Call SIP: Understanding the Session Initiation Protocol C=IN IP6 ::0000:1111:2222:3333] m=audio 49170 RTP/AVP 97 96 b=AS:25.4 a=curr:qos local sendrecy a=curr:qos remote none a=des:gos mandatory local sendrecy a=des:gos none remote sendrecy a=rtpmap: 97 AMR a=fmtp:97 mode-set=0,2,5,7 ;maxframes=2 a=rtpmap:96 telephone-event SIP/2.0 200 OK Via: SIP/2.0/UDP pcscf.homenet.com;branch=z9hG4bK4gnm86 Via: SIP/2.0/UDP scscf.homenet.combranch=z9hG4bksa6wee Via: SIP/2.0/UDP pcscf.visitednet.com;branch=z9hG4bK56565 Via: SIP/2.0/UDP :0000:1111:2222:33331:2343;comp=sigcomp branch=z9hG4bkkuyrt To: tel:+1-314-555-1234>;tag=g41334 From: <sip:mobile1@homenet.com>;tag=34199357834 Call-ID: 7o5452gfvtyrfghdgrtt6900gh CSeq: 17 UPDATE Content-Type: application/sdp Content-Length: O=- 28908445761 28908445762 IN IP6 [: ::0000:aaaa:bbbb:cccc] C=IN IP6 [::0000:aaaa:bbbb:cccc) m=audio 5434 RTP/AVP 97 96 b=AS:25.4 a=curr:qos local sendrecy a=curr:qos remote sendrecy a=des:gos mandatory local sendrecy a=des:gos none remote sendrecv a=rtpmap: 97 AMR a=fmtp:97 mode-set=0,2,5,7 ;maxframes=2 a=rtpmap:96 telephone-event SIP/2.0 200 OK Via: SIP/2.0/UDP acscf.homenet.com:branch=z9hG4bksa6wee Via: SIP/2.0/UDP pcscf.visitednet.com;branch=z9hG4bK56565 Via: SIP/2.0/UDP ::0000:1111:2222:33331:2343;comp=sigcomp ;branch=z9hG4bKkuyrt To: tel:+1-314-555-1234>;tag=g41334 From: ip:mobile1@homenet.com>;tag=34199357834 Call-ID: 7o5452gfvtyrfghdgrtt6900gh CSeq: 17 UPDATE Content-Type application/sdp Content-Length: Call Flow Examples O=- 28908445761 28908445762 IN IP6 [::0000:aaaa:bbbb:cccc] t=0 0 C=IN IP6 ::0000:aaaa:bbbb:cccc) m=audio 5434 RTP/AVP 97 96 b=AS:25.4 a=curr:qos local sendrecy a=curr:qos remote sendrecv a=des:gos mandatory local sendrecv a=des:gos none remote sendrecy a=rtpmap: 97 AMR a=fmtp: 97 mode-set=0, 2,5,7 ;maxframes=2 a=rtpmap: 96 telephone-event SIP/2.0 200 OK Via: SIP/2.0/UDP pcscf.visitednet.com;branch=z