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

["DRAGE, Keith (Keith)" <[e-mail]>]

And the only way I can interpret this as a use case is where the ham radio remote point is also the webrtc endpoint. Is that what you are proposing?

Keith

From: rtcweb [mailto:[e-mail]] On Behalf Of Roman Shpount
Sent: 22 December 2015 00:16
To: [e-mail]
Subject: Re: [rtcweb] Working group last call for draft-ietf-rtcweb-audio

Also, some might find interesting what ham radio receivers typically look like:

http://img3.ph.126.net/snBYUz0aHL9x7Fy2mh85MA==/1133499731230960393.jpg

and here is the microphone at higher resolution:

http://i.ebayimg.com/images/i/371238765810-0-1/s-l1000.jpg

As you can see it is designed to send A-D tones.
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Roman Shpount

On Fri, Dec 18, 2015 at 8:12 PM, Roman Shpount <[e-mail]<mailto:[e-mail]>> wrote:
On Fri, Dec 18, 2015 at 7:10 PM, Cullen Jennings (fluffy) <[e-mail]<mailto:[e-mail]>> wrote:

On Dec 18, 2015, at 3:24 PM, Roman Shpount <[e-mail]<mailto:[e-mail]>> 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.


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.
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Roman Shpount