[asterisk-users] Problem in Detecting Dtmf on FXO line.

[Ruben Rögels]

Am 08.07.2011 08:58, schrieb DHAVAL INDRODIYA:
> Hi All,
> 
> I am having Problem in detecting DTMF on analog lines. basically are
> system is in india and telco provider is BSNL [Bharat sanchar Nigam
> LImited].
> 
> We have Purchased Analog card From chinaroby.com <http://chinaroby.com>
> which is X1600P 16 port FXO  card. they also provide us wctdm.c file.
> 
> card is detected successfully, incoming and outgoing calls scenario is
> also fine.
> 
> we are unable to receive dtmf properly it means there is some digit are
> missing when we receive dtmf the ratio of sucess is about to 70% and 30%
> of calls are getting wrong dtmf .
> 
> Dahdi version is 2.3.0.1 and asterisk version 1.6.0.24
> 
> I load module using
> modprobe wctdm opermod=INDIA cidbeforering=1 cidbuflen=1
> fixedtimepolarity=16
> 
> here id  chan_dahdi.conf.

Hello,

did you try plaing with rxgain and txgain?
When I set up a TDM400, I had some issues with DTMF because the signals
where overmodulated.

Regards,
Ruben