Hi Vineet
The UAS can send all the supported codecs in the answer. See the following excerpt from RFC 3264 5.1 Unicast Streams The list of media formats for each media stream conveys two pieces of information, namely the set of formats (codecs and any parameters associated with the codec, in the case of RTP) that the offerer is capable of sending and/or receiving (depending on the direction attributes), and, in the case of RTP, the RTP payload type numbers used to identify those formats. If multiple formats are listed, it means that the offerer is capable of making use of any of those formats during the session. In other words, the answerer MAY change formats in the middle of the session, making use of any of the formats listed, without sending a new offer. Regards, Tarun Gupta Aricent -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Vineet Menon Sent: Tuesday, March 06, 2012 12:50 PM To: [email protected]; opalvoip-devel Subject: [Sip-implementors] Capability negotiation control Hi, Say UAC sends H.261, 263,264 in offer, and now UAS wants to select one among them. UAS supports all three. Now, can UAS send all three codec it supports or it sends only the one preferred by it in the response? UAC -------------------------INVITE/H.261,H.263, H.264-------------------> UAS UAC <-----------------------200 OK/ ???????------------------------------------ UAS Regards, Vineet Menon _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors =============================================================================== Please refer to http://www.aricent.com/legal/email_disclaimer.html for important disclosures regarding this electronic communication. =============================================================================== _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
