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.
--
Paul
