INVITE sip:user@company.com SIP/2.0
Via: SIP/2.0/UDP 255.255.255.255;branch=0
Via: SIP/2.0/UDP 135.180.130.57;branch=0
Call-ID: 0384840201@10.1.1.1
CSeq: 0 INVITE
To: sip:user@company.com
From: sip:user@university.edu;tag=2229
Content-Type: application/sdp

v=0
o=mhandley 29739 7272939 IN IP4 126.5.4.3
c=IN IP4 224.2.17.12/127
m=audio 492170 RTP/AVP 0 4 12
m=video 3227 RTP/AVP 31
a=rtpmap:31 LPC
