v=0 o=Mozilla-SIPUA-35.0a1 5184 0 IN IP4 0.0.0.0 s=SIP Call c=IN IP4 224.0.0.1/100/12 t=0 0 a=rtcp-fb:120 nack m=video 9 RTP/SAVPF 120 c=IN IP4 0.0.0.0 a=rtpmap:120 VP8/90000