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 > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > > i _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
