[Asterisk-Users] DTMF detection when outgoing call to mobile phones

[Steve Underwood]

Marc Scheuffler wrote:

>Hi all,
>
>I am trying to detect DTMF keys from a mobile when asterisk make an
>outgoing call to the mobile.
>
>The DTMF detection on incoming calls (also FROM mobiles) is working very
>well.
>The only problem is if asterisk called the phone... Nothing is detected.
>
>I am using a digium te205p with PMX/PSTN connection.
>
>Everything that I can find in forums are problems with dtmf detection on
>SIP.
>
>Any suggestions?
>  
>
Can you hear DTMF tones from the cellphone when you call it? It is 
possible they are not produced. I'm not sure if that is a handset or 
network issue, but I had this happen a few years ago when implementing 
an IVR that called subscribers for notification, and expected input from 
them. Most of the time it worked, but some phones in some locations sent 
nothing. If the phone made a call from the same location there was no 
problem.

Steve