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Re: Proposal: Fire a toneDiscarded event while discarding the invalid DTMF values.

From: tim panton <thp@westhawk.co.uk>
Date: Fri, 13 Jun 2014 14:03:33 +0100
Cc: "Makaraju, Maridi Raju (Raju)" <Raju.Makaraju@alcatel-lucent.com>, Stefan HŚkansson LK <stefan.lk.hakansson@ericsson.com>, Harald Alvestrand <harald@alvestrand.no>, Justin Uberti <juberti@google.com>, Kiran Kumar Guduru <kiran.guduru@samsung.com>, "public-webrtc@w3.org" <public-webrtc@w3.org>
Message-Id: <0CAD72DF-2026-4840-86C3-0F6409DD3C8A@westhawk.co.uk>
To: Adam Bergkvist <adam.bergkvist@ericsson.com>

On 13 Jun 2014, at 13:27, Adam Bergkvist <adam.bergkvist@ericsson.com> wrote:

> On 2014-06-13 14:11, Makaraju, Maridi Raju (Raju) wrote:
>>> On 13/06/14 10:00, Harald Alvestrand wrote:
>>>> On 06/13/2014 07:47 AM, Justin Uberti wrote:
>>>>> Passing in a bad string of tones seems like a programming error, and
>>>>> we should throw an exception immediately.
>>> 
>>> +1
>>> 
>>>>> 
>>>> 
>>>> are you suggesting that all apps should be required to know how to strip
>>>> +1 (707) 344-4489 to 17073444489, or are you suggesting a more complex
>>> 
>>> IMO it should be required to know how to strip.
>> 
>> [Raju] IMO, insertDTMF() API ignoring standard well-known phone
>> numbers format separators (for readability) is probably better. These
>> include "+-.()". This behavior makes webrtc consistent existing
>> systems where these are mostly ignored. This also makes it consistent
>> with webrtc handling of "," even though it is not a DTMF symbol.
>> These separators are documented in
>> http://www.ietf.org/rfc/rfc3601.txt . This RFC uses 'p' for pause
>> instead of ','. I think ',' is widely accepted and is ok for webrtc
>> use.
>> 
>> I also agree with the comment that every app writing code to parse
>> and remove these very common separators is un-necessary and may give
>> bad taste for the API.
> 
> So if the general rule would be to throw on unrecognized characters. But we add common number separators, like "+-.()", to our list of recognized, but specially handled characters (to be ignored in this case). And then we don't notify the script when we simply skip over an ignored character.
> 
> That would work for me.

Iím sorry, but this is absurd. Why donít we implement the whole Hayes modem AT DT command set while we are about it?

We have a perfectly good dynamic programming language (Javascript) that does pattern matches and replacements
which is ideal for this sort of thing (should it ever be needed). Iím fundamentally opposed to burying e164 behaviours in
a W3C spec.

Iíd add that the whole DTMF thing is needless anyhow - WebAudio is perfectly capable of generating and recognising
DTMF tones on a mediaStream.

Can we please stop re-inventing ISDN ?

Tim.

> 
> /Adam
Received on Friday, 13 June 2014 13:04:06 UTC

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