 el:+1-314-555-1234>;tag=g41334 From: sip:mobile1@homenet.com>;tag=34199357834 Call-ID: 7o5452gfvtyrfghdgrtt6900gh CSeq: 16 PRACK Content-Length: 0 SIP/2.0 200 OK Via: SIP/2.0/UDP [: :0000:1111:2222:33331:2343;comp=sigcomp branch=z9hG4bK454245 To: el:+1-314-555-1234>;tag=g41334 From: k<sip:mobile1@homenet.com>;tag=34199357834 Call-ID: 7o5452gfvtyrfghdgrtt6900gh CSeq: 16 PRACK Content-Length: 0 UPDATE sip: [: 00:aaaa:bbbb:cccc]:8767;comp=sigcomp SIP/2.0 Via: SIP/2.0/UDP ::0000:1111:2222:33331:2343;comp=sigcomp branch=z9hG4bKkuyrt Max-Forwards: 70 Route: sip:pcscf.visitednet.com;lr>, <scscf.homenet.comlr> ip:pscsf.homenet.com;lr> To: <tel:+1-314-555-1234>;tag=g41334 From: k<sip:mobile1@homenet.com>;tag=3419935783 P-Access-Network-Info: Call-ID: 7o5452gfvtyrfghdgrtt6900gh CSeq: 17 UPDATE Contact: k<sip:[::0000:1111:2222:33331:2343;comp=sigcomp> Supported: 100rel Require: precondition Proxy-Require: sec-agree Allow: INVITE, ACK, CANCEL, BYE, PRACK, MESSSAGE, REFER, UPDATE Security-Verify: ipsec-3gpp; q=0.1; alg=hmac-sha-1-96; spi=34341 ; :port1=4323 Content-Type: application/sdp Content-Length: SIP: Understanding the Session Initiation Protocol O=- 2890844526 2890844527 IN IP6 :0000:1111:2222:33331 s=Phone Call t=0 0 C=IN IP6 [::0000:1111:2222:33331 m=audio 49170 RTP/AVP 97 96 b=AS:25.4 a=curr:gos 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 UPDATE sip: [::0000:aaaa:bbbb:cccc]:8767;comp=sigcomp SIP/2.0 Via: SIP/2.0/UDP pcscf.visitednet.com;branch=z9hG4bK56565 Via: SIP/2.0/UDP ::0000:1111:2222:33331:2343;comp=sigcomp bbranch=z9hG4bkkuyrt Max-Forwards: 69 Route: <scscf.homenet.com;lr> <sip:pscsf.homenet.com;lr> To: <tel:+1-314-555-1234>;tag=g41334 From: sip:mobile1@homenet.com>;tag=34199357834 P-Access-Network-Info: P-Charging-Info: Call-ID: 7o5452gfvtyrfghdgrtt6900gh CSeq: 17 UPDATE Contact: <sip: [::0000:1111:2222:33331:2343;comp=sigcomp> Supported: 100rel Require: preconditi