On Fri, Mar 02, 2007 at 01:48:21PM -0800, Yuan LIU wrote:
> >From: Tzafrir Cohen <[EMAIL PROTECTED]>
> >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?
> >>
> >> (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.
No. I mean: bad distortion of the analog audio that breaks the DTMF
detection (which is done in Asterisk).
>
> >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.
Record it to a sound file.
A simplistic but useful test is to play that very same sound file to a
phone and see if it "dials" the digits you have expected it to dial.
--
Tzafrir Cohen
icq#16849755 jabber:[EMAIL PROTECTED]
+972-50-7952406 mailto:[EMAIL PROTECTED]
http://www.xorcom.com iax:[EMAIL PROTECTED]/tzafrir
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