See below. > -----Original Message----- > From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip- > implementors-boun...@lists.cs.columbia.edu] On Behalf Of Michael > Hirschbichler > Sent: Friday, March 12, 2010 8:52 AM > Cc: sip-implementors@lists.cs.columbia.edu > Subject: Re: [Sip-implementors] Offer-answer question > > Thx, > > this is also my opinion. > To point it down: there is no way to use G726 in *any* direction > without > Re-INVITEs - is this correct? > [Neel] Since the offer contains G726, the endpoint A should be prepared to receive G726. No Re-INVITE is necessary.
Thanks, Neel. > BR > Michael > > Am 12.03.2010 15:48, schrieb Arunachala: > > Not entirely true. A& B can talk using both G729 and PCMA. Either > one > > can switch between these two codecs without the use of a reINVITE. > > > > -Arun > > > > On Fri, Mar 12, 2010 at 7:34 PM, Aneesh Naik<aneesh.n...@gmail.com> > wrote: > >> Hi Michael, > >> > >> This will not be allowed. A (UAC) has sent all the codecs it > supports, > >> and B (UAS) has respoded with the codecs it is willing to talk to A > for this > >> call. Only one codec will be negotiated for media transfer between A > and B. > >> In your example below, the negotiated codec is G.729, so both the > parties > >> must send media on G.729 codec. > >> > >> If the codec needs to change it between, then there can be a Re- > NVITE to > >> change the codec, and both parties once aggreed will start talking > on that > >> new codec negotiated. > >> > >> Thanks, > >> Aneesh > >> On Fri, Mar 12, 2010 at 7:14 PM, Michael Hirschbichler< > >> s...@hirschbichler.biz> wrote: > >> > >>> Hi all, > >>> > >>> In my specific test-case, client A sends an INVITE offering some > codecs > >>> and client B answers with a 200OK containing a subset of these > codecs. > >>> Is it allowed for client B to transmit media using a codec > presented in > >>> the offer of client A but not acknowledged in the answer of client > B? > >>> > >>> e.g.: > >>> > >>> client A sends: > >>> INVITE > >>> m= G726, G729, G723, PCMA, PCMU > >>> > >>> client B responses: > >>> 200OK > >>> m= G729, PCMA > >>> > >>> the resulting media-exchange: > >>> > >>> A====G729====>B > >>> A<====G726====B > >>> > >>> is this allowed? Must A accept the G726-media? > >>> > >>> BR and thx in advance > >>> Michael > >>> _______________________________________________ > >>> Sip-implementors mailing list > >>> Sip-implementors@lists.cs.columbia.edu > >>> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > >>> > >> _______________________________________________ > >> Sip-implementors mailing list > >> Sip-implementors@lists.cs.columbia.edu > >> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > >> > > > > _______________________________________________ > > Sip-implementors mailing list > > Sip-implementors@lists.cs.columbia.edu > > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
