I have seen the similar issue with a Polycom video phones. By the time Polycom fixed it, we were just ignoring the duplicate payload number to have a+v call.
Thanks, -kashif *"All you need is ignorance and confidence and success is sure."* -Mark Twain On Tue, Sep 18, 2012 at 10:39 AM, Gaurav Kumar <[email protected]>wrote: > Hi All, > > Consider the below SDP from Polycom SIP endpoint . The rtpmap and fmtp > uses same payload number 96 for h264 and h263 video codec. According to RFC > standards of RTP and SDP, same payload numbers can be given when it is in > the scope of media line. I mean audio and video codecs can have same > dynamic payload numbers. > > Is it allowed to keep same dynamic payload numbers for different video > codecs ? How the SIP UA should behave in this scenario ? > > Does it accept the first video codec and neglect the other video codec > with same payload number or does it establish audio only session if audio + > video stream is sent in SDP. > > v=0 > o=POLYCOM 0 33 IN IP4 10.19.16.74 > s=- > c=IN IP4 10.19.16.74 > b=AS:1024 > t=0 0 > m=audio 49678 RTP/AVP 9 0 8 115 102 15 18 101 > a=rtpmap:9 G722/8000 > a=rtpmap:0 PCMU/8000 > a=rtpmap:8 PCMA/8000 > a=rtpmap:115 G7221/32000 > a=fmtp:115 bitrate=48000 > a=rtpmap:102 G7221/16000 > a=fmtp:102 bitrate=32000 > a=rtpmap:15 G728/8000 > a=rtpmap:18 G729/8000 > a=fmtp:18 annexb=no > a=rtpmap:101 telephone-event/8000 > a=fmtp:101 0-15 > a=sendrecv > m=video 49680 RTP/AVP 116 96 110 96 34 111 31 > b=TIAS:1024000 > a=rtpmap:116 vnd.polycom.lpr/9000 > a=fmtp:116 V=1;minPP=0;PP=150;RS=52;RP=10;PS=1400 > a=rtpmap:96 H264/90000 > a=fmtp:96 profile-level-id=428020; max-mbps=244800; max-fs=8160; sar=13 > a=rtpmap:110 H264/90000 > a=fmtp:110 profile-level-id=428020; packetization-mode=1; max-mbps=244800; > max-fs=8160; sar=13 > a=rtpmap:96 H263-1998/90000 > a=fmtp:96 CIF4=2;CIF=1;QCIF=1;SQCIF=1;CUSTOM=352,240,1;CUSTOM=704,480,2 > a=rtpmap:34 H263/90000 > a=fmtp:34 CIF4=2;CIF=1;QCIF=1;SQCIF=1 > a=rtpmap:111 H264/90000 > a=fmtp:111 profile-level-id=640020; packetization-mode=1; max-mbps=244800; > max-fs=8160; sar=13 > a=rtpmap:31 H261/90000 > a=fmtp:31 CIF=1;QCIF=1 > a=sendrecv > a=rtcp-fb:* ccm fir > m=application 49684 RTP/AVP 100 > a=rtpmap:100 H224/4800 > a=sendrecv > > Best Regards, > Gaurav > > > > > > > > > > > > > > > > > > This is confidential Ittiam property. > > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
