title: media format over SIP?
body: <p>I'm a newbie and a need your help. I have a SIP header like below and it's strange with me @@ please tell me which media this is, and its properties. Thks you.
  (sorry because I'm not good at English :( )</p>
  
  <pre><code>b=AS:512
  t=0 0
  m=audio 49198 RTP/AVP 115 102 9 15 0 8 s18 106 99 101
  a=rtpmap:115 G7221/32000
  a=fmtp:115 bitratg=48000
  a=rtpmap:102 G7221/16000
  a=fmtp:102 bitrate=32000
  a=rtpmap:9 G722/8000
  a=rtpmap:15 G728/8000
  a=rtpmap:0 PCMU/8000
  a=rtpmap:8 PCMA/8000
  a=rtpmap:18 G729/8000
  a=fmtp:18 annexb=no
  a=rtpmap:106 SIREN22/48000
  a=fmtp:106 bitrate=64000
  a=rtpmap:99 SIREN14/16000
  a=fmtp:99 bitrate=48000
  a=rtpmap:101 telephone-event/8000
  a=fmtp:101 0-15
  a=sendrecv
  m=video 49200 RTP/AVP 109 110 111 96 34 31
  b=TIAS:512000
  a=content:main
  a=label:1
  a=rtpmap:109 H264/90000
  a=fmtp:10= profile-level-id=42801f; max-mbps=108000; max-fs=3600; sar=13
  a=rtpmap:110 H264/90000
  a=fmtp:110 profile-level-id=42801f; packetization-mode=1; max-mbps=108000; max-fs=3600; sar=13
  a=rtpmap:111 H264/90000
  a=fmtp:111 profile-level-id=64001f; packetization-mode=1; max-mbps=108000; max-fs=3600; sar=13
  a=rtpmap:96 H263-1998/90000
  a=fmtp:96 CIF=1;QCIF=1;SQCIF=1;J;T
  a=rtpmap:34 H263/90000
  a=fmtp:34 CIF=1;QCIF=1;SQCIF=1
  a=rtpmap:31 H261/90000
  a=fmtp:31 CIF=1;QCIF=1
  a=sendrecv
  VideoMode:9
  </code></pre>