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

Peter Saint-Andre <stpeter@stpeter.im> Sat, 03 April 2010 02:19 UTC

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Subject: Re: [codec] #5: Mention DTMF in requirements
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Agreed, this seems unnecessary. We have more important things to focus
on for now. :)

On 4/2/10 8:10 PM, Roman Shpount wrote:
> +1
> _____________
> Roman Shpount
> 
> 
> On Fri, Apr 2, 2010 at 9:57 PM, Benjamin M. Schwartz
> <bmschwar@fas.harvard.edu <mailto: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
>