It is OK that the answer uses a different payload. However, the Answer in you example is not correct because it includes payload 96, but no "rtpmap". Assuming the answerer wants payload 97 for telephone-event, it should look like this:
Answer m: audio 8000 RTP/AVP 18 0 97 rtpmap: 18 G729/8000 rtpmap: 0 PCMU/8000 fmtp:97 0-15 rtpmap:97 telephone-event/8000 cheers, (-:bob Robert F. Penfield Chief Software Architect Acme Packet, Inc. 71 Third Avenue Burlington, MA 01803 [EMAIL PROTECTED] ----- Original Message ----- From: <[EMAIL PROTECTED]> To: "SIP Implementors" <[email protected]> Cc: "SIP IETF" <[email protected]> Sent: Wednesday, September 07, 2005 12:57 PM Subject: [Sip-implementors] SDP query > Hi, > > Just want to know if following offer-answer exchange is correct, it has > different dynamic payload types for DTMF and telephone events, > is it necessary for both these to be same ? > If they are not same, then how both parties will use these values to send > telephone-events and DTMF digits. > > Offer: > m: audio 8000 RTP/AVP 18 0 96 > rtpmap: 18 G729/8000 > rtpmap: 0 PCMU/8000 > fmtp:96 0-15 > rtpmap:96 telephone-event/8000 > > Answer > m: audio 8000 RTP/AVP 18 0 96 97 > rtpmap: 18 G729/8000 > rtpmap: 0 PCMU/8000 > fmtp:96 0-15 > rtpmap:97 telephone-event/8000 > > > Thanks, > Udit > _______________________________________________ > Sip-implementors mailing list > [email protected] > http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
