Hi Richard, this sounds logical, but I think most SIP implementations just compare payload type numbers, not the actual codecs used.
So payload type numbers are equated with codecs. Best Regards Philipp Schöning Am Mo., 29. Okt. 2018 um 12:30 Uhr schrieb Richard Phernambucq < r.phernamb...@cuperus.nl>: > Hi Philipp, > > >> So the "m="line has to contain one payload value of the offer?! > It has to contain a codec (format) listed in the offer, not a payload > type number. > > The codec specifies the format of the RTP sent. Both sides need to be > able to code/decode the format (e.g. PCMA) so both offer and answer must > indicate the same codec. The payload type number is used in the payload > type field of sent RTP packets to indicate to the receiving side which > format this RTP packet's payload is in. > > Best regards, > Richard Phernambucq > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
