[Freeswitch-users] How to enable Hardware DTMF detection (Dahdi/Digium card)

[Steve Underwood]

On 04/25/2012 12:08 AM, Haythem Horbit wrote:
> I had disabled echo canceller modules but the problem didn't resolved
>  ( wctdm24xxp 0000:25:08.0: VPM: Support Disabled   see : 
> http://kb.digium.com/articles/FAQ/How-do-I-disable-echo-cancellation-module-without-removing-the-hardware?retURL=%2F&popup=false 
> <http://kb.digium.com/articles/FAQ/How-do-I-disable-echo-cancellation-module-without-removing-the-hardware?retURL=%2F&popup=false>)
> I'am using mod_freetdm   (dahdi)
Try relaxing the DTMF twist thresholds. The need for that seems to 
typically be a problem with calls from cellular systems, but it can 
happen elsewhere when something is screwing badly with the frequency 
response. Someone put changes into git recently so you can change the 
setting through channel variables.

Steve
>
> 2012/4/24 Steve Underwood <steveu at coppice.org <mailto:steveu at coppice.org>>
>
>     On 04/24/2012 07:46 PM, Haythem Horbit wrote:
>     > Hi,
>     >
>     > We experience some issues to capture SIA ContactID messages from an
>     > alarm system, with Freeswitch,
>     > the problem is that some DTMFs are missed randomly, so that we can't
>     > have a correct message
>     > we use a Digium card 'AEX2400' with DAHDI drivers, the alarm
>     system is
>     > connected to an FXO port.
>     >
>     > We see in the freeswitch log that software DTMF detection is
>     enabled,
>     > may be the issue comes from this fact...
>     >
>     > So our question is: how can we enable hardware DTMF detection in
>     DADHI
>     > configuration with freeswitch,
>     > and how to disable software DTMF detection in freeswitch
>     Does your card have one of those octasic echo canceller modules? Those
>     things are a menace.
>
>     Steve
>