th: 159 O=- 28908445761 28908445761 IN IP6 [::0000:aaaa:bbbb:cccc] Call Flow Examples 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 none a=curr:gos 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 PRACK sip: (::0000:aaaa:bbbb:cccc]:8767;comp=sigcomp SIP/2.0 Via: SIP/2.0/UDP ::0000:1111:2222:33331:2343;comp=sigcomp branch=z9hG4bK454245 Max-Forwards: 70 Route: sip:pcscf.visitednet.com; lr>, <scscf.homenet.com:lrx <sip:pscsf.homenet.com;lr> To: el:+1-314-555-1234>;tag=g41334 From: <sip:mobile1@homenet.com>;tag=34199357834 P-Access-Network-Info: Call-ID: 7o5452gfvtyrfghdgrtt6900gh CSeq: 16 PRACK Contact:<sip:[::0000:1111:2222:33331:2343;comp=sigcomp> Supported: 100rel Require: precondition Allow: INVITE, ACK, CANCEL, BYE, PRACK, MESSSAGE, REFER, UPDATE RACK: 98205 15 INVITE Content-Length 0 PRACK sip:[::0000:aaaa:bbbb:cccc]:8767;comp=sigompSIP/2.0 Via: SIP/2.0/UDP pcscf.visitednet.com:branch=z9hG4bK565355 Via: SIP/2.0/UDP :0000:1111:2222:33331:2343;comp=sigcomp branch=z9hG4bK454245 Max-Forwards: 69 Route: <sip:pscsf.homenet.com;lr>, <sip:scscf.homenet.com;er> To: el:+1-314-555-1234>;tag=g41334 From: <sip:mobile1@homenet.com>;tag=34199357834 P-Access-Network-Info: Call-ID: 7o5452gfvtyrfghdgrtt6900gh CSeq: 16 PRACK Contact: <sip:[::0000:1111:2222:33331:2343;comp=sigcomp> Supported: 100rel Require: precondition Allow: INVITE, ACK, CANCEL, BYE, PRACK, MESSSAGE, REFER, UPDATE RACK: 98205 15 INVITE Content-Length: 0 PRACK sip:[::0000:aaaa:bbbb:cccc]:8767;comp=sigcomp SIP/2.0 Via: SIP/2.0/UDP scscf.homenet.com;branch=z9hG4bkhj5fy SIP: Understanding the Session Initiation Protocol Via: SIP/2.0/UDP pcscf.visitednet.com;branch=z9hG4bK7866 Via: SIP/2.0/UDP [::0000:1111:2222:33331:2343;comp=sigcomp branch=z9hG4bK454245 Max-Forwards: 68 To: <tel:+1-314-555-1234>;tag=g41334 From: <sip:mobile1@homenet.com>;tag=34199357834 Call-ID: 7o5452gfvtyrfghdgrtt6900gh CSeq: 16 PRACK C