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Re: [rtcweb] Working group last call for draft-ietf-rtcweb-audio

Tim Panton <tim@phonefromhere.com> Tue, 26 January 2016 12:15 UTC

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From: Tim Panton <tim@phonefromhere.com>
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Date: Tue, 26 Jan 2016 12:15:06 +0000
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To: "Cullen Jennings (fluffy)" <fluffy@cisco.com>
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] Working group last call for draft-ietf-rtcweb-audio
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> On 19 Dec 2015, at 00:10, Cullen Jennings (fluffy) <fluffy@cisco.com <mailto:fluffy@cisco.com>> wrote:
> 
> 
>> On Dec 18, 2015, at 3:24 PM, Roman Shpount <roman@telurix.com <mailto:roman@telurix.com>> wrote:
>> 
>> This applies to all DTMF tones, not A-D specifically. What I am saying is that WebRTC endpoints must be able to generate all DTMF tones including A-D and send them to legacy PSTN (gateway).
> 
> The thing people keep asking is why? what is the use case ?
> 
> I don’t feel like I have seen an answer to this. 

More specifically - Under what circumstances will we need them where 
the same result couldn’t be achieved by injecting the correct notes into the stream using webAudio?
It has been suggested that webaudio tone generation might not work with certain sets of codecs.
But surely the (few) legacy systems (coal mines for example) that use A-D will be using G711
for which tone generation should work well.

(I might add that tone _detection_ can also be done in webaudio so developers have a symmetrical solution).

Tim.

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Tim Panton - Web/VoIP consultant and implementor
www.westhawk.co.uk <http://www.westhawk.co.uk/>

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