Re: [rtcweb] Support DTMF "codec" or expose DTMF in signaling? (Re: DTMF usecase before DTMF API)

[Matthew Kaufman <[e-mail]>]

On 11/18/11 6:48 PM, Saúl Ibarra Corretgé wrote:
>>> In case http://tools.ietf.org/html/draft-kaplan-dispatch-info-dtmf-package-00
>>> becomes a standard, there is no need to send DTMF over the media
>>> stream (when interoperating with SIP networks). Since this just
>>> concerns the in-the-wire signaling it becomes up to the application
>>> developer.
>>>
>>>
>> Are you advocating that we not put DTMF-in-media support in browsers (in which case I have a good argument against), or are you simply making an observation about an alternative that may also become available?
>>
> Do you have any application for DTMF in mind other than PSTN interoperability? I'd like to hear that argument against not having DTMF-in-media support in the browser :-)
>

Sure. Two-way radio systems using ROIP.

For example, from 
http://www.safecomprogram.gov/SiteCollectionDocuments/BSICoreImplementationProfile.pdf

"6.4 DTMF

A BSI complying with this implementation profile MUST support “RTP 
Payload for DTMF
Digits, Telephony Tones and Telephony Signals”, RFC 4733 [7] for the 
sending and
receiving of DTMF digits."

And of course, yes, *also* PSTN interoperability.

Matthew Kaufman