I think the first audio line and the first video line in the answer should be taken as the negotiated codecs.
Thanks, Mayank. Mayank Kamthan On Wed, Apr 16, 2014 at 12:21 PM, isshed <isshed....@gmail.com> wrote: > Hi All, > > I have 1 basic query regarding ofer-answer model > > > Phone1 is sending the offer with 2 audio mlines and 2 video mline like > as follows. > > > m=audio 3342 RTP/SAVP 0 8 127 > a=crypto:7 AES_CM_128_HMAC_SHA1_80 inline:2222222222 > a=rtpmap:0 PCMU/8000 > a=rtpmap:8 PCMA/8000 > a=rtpmap:127 telephone-event/8000 > m=audio 3342 RTP/AVP 0 8 127 > a=rtpmap:0 PCMU/8000 > a=rtpmap:8 PCMA/8000 > a=rtpmap:127 telephone-event/8000 > m=video 5544 RTP/SAVP 109 > a=crypto:8 AES_CM_128_HMAC_SHA1_80 inline:3333333333 > a=rtpmap:109 H264/90000 > a=fmtp:109 profile-level-id=42800d > m=video 5544 RTP/AVP 109 > a=rtpmap:109 H264/90000 > a=fmtp:109 profile-level-id=42800d > > and phone 2 is responding with all the 4 m lines as follows > > m=audio 4344 RTP/SAVP 0 8 127 > a=rtpmap:0 PCMU/8000 > a=rtpmap:8 PCMA/8000 > a=rtpmap:127 telephone-event/8000 > m=audio 4344 RTP/AVP 0 8 119 > a=sendrecv > a=rtpmap:0 PCMU/8000 > a=rtpmap:8 PCMA/8000 > a=rtpmap:119 telephone-event/8000 > a=fmtp:119 0-15 > m=video 7878 RTP/SAVP 109 > a=crypto:8 8 AES_CM_128_HMAC_SHA1_80 inline:4444444444 > a=rtpmap:109 H264/90000 > a=fmtp:109 profile-level-id=42800d > m=video 7878 RTP/AVP 109 > a=sendrecv > a=rtpmap:109 H264/90000 > a=fmtp:109 profile-level-id=42801e; max-mbps=49000; max-br=20010; > sar=13 > > > > > Which m line should phone1 select to send and receive audio and video. > > let me know is query is not clear. > > > Thanks, > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
