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
