INVITE sip:bob@biloxi.com SIP/2.0 Via: SIP/2.0/UDP 20.22.24.26:5060; Via: SIP/2.0/UDP 192.168.1.10:5060; received=18.17.16.15:25588;branch=z9hG4bKnashds8 Record-Route: Max-Forwards: 70 To: Bob From: Alice ;tag=1928301774 Call-ID: a84b4c76e66710 CSeq: 314159 INVITE Contact: Content-Type: application/sdp Content-Length: 142 v=0 o=alice 53655765 2353687637 IN IP4 20.22.24.27 s=- t=0 0 c=IN IP4 20.22.24.27 m=audio 20333 RTP/AVP 0 1 3 99 a=rtpmap:0 PCMU/8000