Re: [rtcweb] DTMF resolution proposal

[Roman Shpount <[e-mail]>]

On Tue, Mar 8, 2016 at 8:29 PM, Jean-Marc Valin <[e-mail]> wrote:

> I'm not going to make a big deal out of this, but it feels to me like
> the default duration should be in the W3C doc rather than in the IETF
> doc since it describes browser behaviour rather than something can can
> be observed on the wire. Of course, it doesn't hurt either, so I won't
> object if people disagree with me.
>

I would prefer the recommended values to stay in audio draft.

This draft already specifies preferences, such as not using CN with OPUS,
so it would make sense to include DTMF tone and gap duration preferences as
well.

The recommendations are there to improve interoperability of WebRTC end
points with traditional PSTN, so it is not something that should be defined
by W3C document.

This data useful in providing guidance for interop tests for gateways,
SBCs. or any other equipment which is designed to work with WebRTC. I do
not think gateway implementer should go through the API document to find
the typical tone and gap duration for WebRTC.

Finally, I have proposed to include this data as non-normative, information
only value, so there is very little harm in it being there.

Regards,
_____________
Roman Shpount