I want to make it inter-operable with Polycom's real presence desktop.
On Thu, Apr 17, 2014 at 6:43 PM, Paul Kyzivat <pkyzi...@alum.mit.edu> wrote: > On 4/17/14 12:45 AM, isshed wrote: >> >> Thanks Paul and everyone ... >> >> I am designing Phone1 to use only one audio and one video. Phone1 >> supports secured media as well. so it is offering both secure/non >> secure to phone2 and expects phone2 to select among the given m-lines >> (RTP and SRTP). > > > And what is this expected to work with? > That is probably more important than what is theoretically correct. > > Thanks, > Paul > > >> Thanks. >> >> On Wed, Apr 16, 2014 at 7:54 PM, Paul Kyzivat <pkyzi...@alum.mit.edu> >> wrote: >>> >>> I read a number of the replies to this, but couldn't find an obvious >>> place >>> to jump in, so I'm just replying here. >>> >>> An offer multiple audio and/or video m-lines does not mean that they are >>> *alternatives*. Absent some explicit indication, there is no way to know >>> what the offerer's intent is in offering them, nor does the offerer know >>> what the answerer's intent is in accepting them. >>> >>> In the given example, if the offerer only intends to use one audio and >>> one >>> video, then it can arbitrarily choose one, and hope that this works >>> reasonably for the answerer. In that case it should do another O/A and >>> reject the ones it doesn't intend to use. >>> >>> If you are designing phone1, and your goal is to have one audio and one >>> video, but you want to offer more possibilities than you can express with >>> one audio and one video m-line, then post back with what you are trying >>> to >>> accomplish, and we can discuss recommended ways of achieving that. >>> >>> Thanks, >>> Paul >>> >>> >>> On 4/16/14 2:51 AM, isshed 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 >> >> > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
