Prince, RTP DTMF as per RFC 2833 is still "out of band"...although it is sometimes referred to as inband in context to separate signalling path. So, you have multiple options for out-of-band -RFC 2833, SIP INFO, SIP NOTIFY. Ideally(only) from interoperability perspective your equipment should be prepared to receive DTMF based upon any method (including in-band) and send it only thru' the method published by the peer end. Typically, SIP level lack of support can be detected only thru' a 5xx error which causes unacceptable delay for transmitting DTMF on media path, therefore it might also be a good idea to offer DTMF options as configurable on your equipment (although this may reduce on the fly interoperability...may be acceptable in certain cases)
I have seen IP equipments offer RTP DTMF in SDP by default but are prepared to receive RTP DTMF by all means. And, would send RTP DTMF only if peer end publishes the same in SDP else use SIP INFO method. hope this helps, -kapil nayar --- Prince Arimboor Philip <[EMAIL PROTECTED]> wrote: > Hi all, > > what is the recommended way of communicating the > DTMF digits? > > Also please tell me which is the mechanism used by > most of the SIP end > points to communicate the DTMF digits? > > thanks in advance, > Prince > > > > *********************** FSS- Confidential ***********************> _______________________________________________ > Sipping mailing list > https://www1.ietf.org/mailman/listinfo/sipping > This list is for NEW development of the application > of SIP > Use [email protected] for questions > on current sip > Use [email protected] for new developments of core SIP ___________________________________________________________ Yahoo! Photos NEW, now offering a quality print service from just 7p a photo http://uk.photos.yahoo.com _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
