- From: Stefan Håkansson LK <stefan.lk.hakansson@ericsson.com>
- Date: Thu, 14 Jul 2011 15:40:37 +0200
- To: Ian Hickson <ian@hixie.ch>, "public-webrtc@w3.org" <public-webrtc@w3.org>
>On Tue, 12 Jul 2011, Cullen Jennings wrote: >> >> Just a side note, the best way to do DTMF (RFC 4733) is not as an audio >> tone but as a seperate coded for transering the data that keys werhe >> pressed. > >I'm all for supporting DTMF. It seems that the main use case would be >communicating with legacy systems (on the Web, one would presumably use a >native AJAX app or some such and only use audio/video conferencing to >speak to an actual human), so it seems one of our requirements here has to >be interoperability with the POTS, and thus with legacy SIP systems. > >How do legacy SIP systems support DTMF? We presumably have to do it the >same way. My understanding is that RFC 4733 is used (inserting a special payload carrying DTMF in the RTP stream).
Received on Thursday, 14 July 2011 13:45:09 UTC