Re: [rtcweb] DTMF resolution proposal

[Jean-Marc Valin <[e-mail]>]

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On 03/09/2016 10:31 AM, Roman Shpount wrote:
> I would prefer the recommended values to stay in audio draft.

OK, I can live with that and include the text you proposed:

"WebRTC endpoints generated events MUST have duration of no more than
8000 ms and no less than 40 ms with the recommended default duration
of 100 ms for each tone. The gap between events MUST be no less then
30 ms with the recommended default duration of 70 ms."

Cheers,

	Jean-Marc

> 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
> 
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