[Asterisk-Users] European and/or US DTMF Tones?

[Angus Berry]

I ask because of seeing proprietary hardware such as Dialogic's
trumpting about howthey can detect European & US DTMF. In the past I've
had cheap voicemail cards that couldn't pick up DTMF from UK callers
across the pond.

On Thu, 2004-04-01 at 09:10, Steve Underwood wrote:
> Angus Berry wrote:
> 
> >My business is somewhat trans-atlantic. Does anyone know if Asterisk's
> >DTMF processing is:
> >
> >a) European OR US
> >
> >b) European AND US
> >
> >c) It's hardware dependent you fool.
> >
> >d) here's a better answer
> >
> >thanks :-)
> >  
> >
> The DTMF specs vary between countries, but not in ways that really 
> matter to anyone. The variations are just things like how off frequency 
> the tones may be, the minimum signal level at which they must be 
> detected, and so on. For practical purposes DTMF is universal. The DTMF 
> in * passes a test suite applicable to most countries. With the wonders 
> of open source, you can even try the test suite yourself, if you want 
> (less the part that requires BellCore's copyright talk-off tests data - 
> I can give you a copy of the data I used, but only if you own a copy of 
> BellCore's tapes).
> 
> Regards,
> Steve
> 
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