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

stephen botzko <stephen.botzko@gmail.com> Fri, 26 March 2010 22:10 UTC

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From: stephen botzko <stephen.botzko@gmail.com>
To: Christian Hoene <hoene@uni-tuebingen.de>
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Subject: Re: [codec] #5: Mention DTMF in requirements
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Perhaps analog DTMF carriage is a SHOULD?

I agree that out-of-band is preferable, however, there still are scenarios
where coded DTMF tones will be sent.  It would be nice (though IMHO not
essential) for this carriage to work.

Stephen Botzko

On Fri, Mar 26, 2010 at 3:04 PM, Christian Hoene <hoene@uni-tuebingen.de>wrote:

> Hi,
>
> > If the point of this issue to allow this codec to be used to successfully
> > transit an IP network between two TDM networks,
>
> which is not the primary use-case.
>
> > I'd suggest that out-of-
> > band tone transport is far preferable to trying to ensure that the codec
> > will carry the tones adequately to allow them to be detected after
> > regeneration.
>
> I totally agree. Out-of-band is much better than inband.
>
> Sorry for my radical view but I believe that analog DTMF is an old and
> obsolete technology not worth considering anymore.
>
> Christian
>
>
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