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Re: [codec] #5: Mention DTMF in requirements

Roman Shpount <roman@telurix.com> Sat, 03 April 2010 02:10 UTC

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From: Roman Shpount <roman@telurix.com>
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Subject: Re: [codec] #5: Mention DTMF in requirements
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+1
_____________
Roman Shpount


On Fri, Apr 2, 2010 at 9:57 PM, Benjamin M. Schwartz <
bmschwar@fas.harvard.edu> wrote:

> Michael Knappe wrote:
> > I would agree with 'should'.
>
> I think DTMF should be ignored entirely as far as requirements.  If
> someone wishes to perform tests, they are welcome to do so and present
> results, but there is no need to require anything.
>
> > Lot's of dtmf out there still, but also out of band options (rfc 2833 /
> 4733) that make in-band carriage less a concern for SIP telephony
> applications.
>
> There are many different machine-to-machine communications systems that
> have been designed to operate over channels that also carry audio.  We
> should not attempt to support any of them.  The only purpose of this codec
> should be to carry sounds to a human ear.
>
> Any machine-to-machine communications SHOULD be decoded from the stream
> prior to compression and transmitted independently.  Any system that
> encodes using the IWAC has access to the input stream, and so can perform
> any required decoding (of rotary clicks, DTMF, fax, DRM watermark, V.42,
> ZX Spectrum cassette, etc.) at that time.
>
> Decoders MAY do whatever they want with the output stream, but any use
> other than listening by a human should be unsupported.
>
> --Ben
>
>
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