SIP/2.0 606 Not Acceptable
Via: SIP/2.0/UDP c.bell-tel.com
From: A. Bell <sip:a.g.bell@bell-tel.com>;tag=3
To: T. Watson <sip:t.watson@ieee.org> ;tag=7434264
Call-ID: 14142@c.bell-tel.com
CSeq: 1 INVITE
Warning: 370 "Insufficient bandwidth (only have ISDN)",
  305 "Incompatible media format",
  330 "Multicast not available"
Content-Type: application/sdp
Content-Length: 258

v=0
o=c 3149329138 3149329165 IN IP4 38.245.76.2
s=Let's talk
t=3149328630 0
b=CT:128
c=IN IP4 x.bell-tel.com
m=audio 3456 RTP/AVP 5 0 7
a=rtpmap:5 DVI4/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:7 LPC/8000
m=video 2232 RTP/AVP 31
a=rtpmap:31 H261/90000