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.) Yuan Liu
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? listen to the audio with e.g. ztmonitor. -- Tzafrir Cohen icq#16849755 jabber:tzafrir@jabber.org +972-50-7952406 mailto:tzafrir.cohen@xorcom.com http://www.xorcom.com iax:guest@local.xorcom.com/tzafrir
>From: Tzafrir Cohen <tzafrir.cohen@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 >icq#16849755 jabber:tzafrir@jabber.org >+972-50-7952406 mailto:tzafrir.cohen@xorcom.com >http://www.xorcom.com iax:guest@local.xorcom.com/tzafrir
On Fri, Mar 02, 2007 at 01:48:21PM -0800, Yuan LIU wrote:> >From: Tzafrir Cohen <tzafrir.cohen@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? > >> > >> (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:tzafrir@jabber.org +972-50-7952406 mailto:tzafrir.cohen@xorcom.com http://www.xorcom.com iax:guest@local.xorcom.com/tzafrir