REGISTER sip:company.com SIP/2.0
To: sip:j.user@company.com
From: sip:j.user@company.com
Call-ID: 0ha0isndaksdj@10.0.2.2
Contact: sip:j.user@host.company.com
CSeq: 8 REGISTER
Via: SIP/2.0/UDP 135.180.130.133
Content-Length: 0



INVITE sip:joe@company.com SIP/3.0
To: sip:joe@company.com
From: sip:caller@university.edu
Call-ID: 0ha0isnda977644900765@10.0.0.1
CSeq: 8 INVITE
Via: SIP/2.0/UDP 135.180.130.133
Content-Type: application/sdp

v=0
o=mhandley 29739 7272939 IN IP4 126.5.4.3
c=IN IP4 135.180.130.88
m=audio 49210 RTP/AVP 0 12
m=video 3227 RTP/AVP 31
a=rtpmap:31 LPC/8000