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RE: Mozilla/Cisco API Proposal: DTMF

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>
Message-ID: <BBF498F2D030E84AB1179E24D1AC41D616C389F0AA@ESESSCMS0362.eemea.ericsson.se>

>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

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