El Miércoles, 25 de Febrero de 2009, Maxim Sobolev escribió: > For some reason you think that the SDP delivered by the Bob to Alice > should somehow affect selection of codecs available for Bob to use when > sending to Alice, but I cannot find any place in the standard where it's > required. > > On contrary, I believe that the SDP RFC (4566) explicitly permits > asymmetric sessions: > > <quote> > sub-fields contain RTP payload type numbers. _When a list of > payload type numbers is given, this implies that all of these > payload formats MAY be used in the session, but the first of these > formats SHOULD be used as the default format for the session._ > </quote> > > Which to me means that if Alice announces G729 and G711 in its SDP it > should be prepared to receive both G729 and G711.
After this explanation it makes more sense now. Thanks. > If it wants to ensure > that only G729 is used after seeing Bob's SDP it should use re-INVITE on > its own. Well, I think it could be easier if Alice announces just G729 in the SDP :) -- Iñaki Baz Castillo _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
