INVITE sip:user@company.com SIP/2.0
CSeq: 0 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