[asterisk-users] DTMF from TDM400P and X100P

[Yuan LIU]

>From: Tzafrir Cohen <tzafrir.cohen at xorcom.com>
>Date: Fri, 2 Mar 2007 22:14:09 +0200
>
>On Fri, Mar 02, 2007 at 09:36:28AM -0800, Yuan LIU wrote:
> > With one IVR payment system, I noticed quite a difference in DTMF
> > transmission between these two cards.  The IVR missed nearly all digits
> > from X100P, while receiving digits from TDM fine.
> >
> > Since neither card process or synthesize audio, what can the difference 
>be?
>
>(At least the TDM400P actually has a hardware TDMF detector, but it is
>not used, AFAIK)
>
> >
> > (This particular IVR has problem with some regular phone devices, too.)
>
>audio quality?

You mean from DAC?  That could make sense - altough the MODEM function X100P 
is designed for would require it to be fairly accurate.  DTMF itself is one 
of basic MODEM functions.

>listen to the audio with e.g. ztmonitor.

Thanks for the input.  Have yet to put a sound card with TDM. (The IVR in 
question is not my machine.)  I suspect that ztmonitor listens to the 
digital output, though.

Yuan Liu
>--
>                Tzafrir Cohen
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