[Standards] Another Jingle implementation

Paul Witty paulrw at codian.com
Thu Feb 7 15:44:48 UTC 2008

Peter Saint-Andre wrote:
>> I already have support for
>> in-band DTMF, and, once I've written the stuff to negotiate it, will
>> support RFC 4733 DTMF in the content channel.  I'll also implement DTMF
>> in the signalling channel.
> I see two options:
> 1. DTMF over XMPP (XEP-0181) ("in-band/signalling")
> 2. DTMF over RTP (RFC 4733) ("out-of-band/media")
> Do you see a third option?
DTMF actually as tones in the audio.  Old-fashioned, but valid enough 
for G.711, and probably some other codecs as well.  Sometimes needed if 
going to a SIP to POTS gateway, and not a bad fallback if the far end 
doesn't offer support for XEP-0181 or RFC 4733.



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