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

Bernard Aboba <bernard.aboba@gmail.com> Sat, 19 December 2015 11:43 UTC

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From: Bernard Aboba <bernard.aboba@gmail.com>
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To: Roman Shpount <roman@telurix.com>
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Cc: "Cullen Jennings (fluffy)" <fluffy@cisco.com>, "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] Working group last call for draft-ietf-rtcweb-audio
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On Dec 18, 2015, at 20:12, Roman Shpount <roman@telurix.com> wrote:
> 
> Because there are IVR systems that use them. They are much less common then IVR systems that use 0-9 * and # but they do exist. I have provided 4 examples of real IVR systems that use these tones. How many do you need to keep the extra tones? All these systems can probably be re-engineered not to use A-D tones, but since this is all legacy no one will spend the time. 
> 
> Your argument that these tones should be removed since they are sometimes blocked (When exactly? The only places I see them blocked are some international carriers) and would not work. The same applies to all DTMF tones. We should remove all telephone-events based on this logic.
> 
> Most importantly I do not want optional tones. So, if we decide to remove A-D, they should not be allowed in the WebRTC API. If these tones are allowed in WebRTC API, everyone must implement them.

[BA] Bingo. To remove optional tones and discovery of tone capability, we either have to prohibit A-D or mandate that these tones be supported.

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