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RE: [rtcweb] summary of issues raised at W3C meeting

From: Matthew Kaufman <matthew.kaufman@skype.net>
Date: Fri, 2 Nov 2012 21:16:34 +0000
To: "Cullen Jennings (fluffy)" <fluffy@cisco.com>, "Timothy B. Terriberry" <tterriberry@mozilla.com>
CC: "rtcweb@ietf.org" <rtcweb@ietf.org>, "public-webrtc@w3.org" <public-webrtc@w3.org>
Message-ID: <AE1A6B5FD507DC4FB3C5166F3A05A484160FFCB4@tk5ex14mbxc272.redmond.corp.microsoft.com>
Cullen Jennings (fluffy):
> Consider the case where a PSTN gateway calls a browser - or at least the
> browser gets an offer with the media stream that will later be used for
> DTMF. The browser still wants to be able to send DTMF to the PSTN on that
> audio track so seems you might need something to be able to do that.

No, I think Tim's right... there's two audio tracks, and only the "outgoing" one needs DTMF and that's not the one on the stream that "pops out" of the RTCPeerConnection.

Of course this is also the other driver for getUserMedia allowing you to get a null media stream... you might want to get a call from a device that expects you to enter some DTMF but you don't have -- or want to provide consent to -- a microphone.

Matthew Kaufman
Received on Friday, 2 November 2012 21:17:31 UTC

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