asterisk users - Jan 2007 - Possibility to catch DTMF when 2 users are in a conversation

Hello,

I will expose my problem here. Please tell me if it is not the right  
place as I am really new to that list.

I use Asterisk as a SIP proxy. I have two users connected to it,  
Let's call them 1234 and 5678

In my dialplan I have two lines:

exten => 1234,1,Dial(SIP/1234)
exten => 5678,1,Dial(SIP/5678)

The SIP phones (X-lite) are configured to send DTMF's using RFC 2833  
mechanism.

I want to know if it is possible in Asterisk to catch a DTMF event  
sent by one of the phone to trigger an action, for example to play a  
sound/video clip to one of the phones.

Thank you very much in advance for your help,

Antoine

>
> exten => 1234,1,Dial(SIP/1234)
> exten => 5678,1,Dial(SIP/5678)
>
> The SIP phones (X-lite) are configured to send DTMF's using RFC 2833 
> mechanism.
>
> I want to know if it is possible in Asterisk to catch a DTMF event 
> sent by one of the phone to trigger an action, for example to play a 
> sound/video clip to one of the phones.
google for features.conf, But you'll need to keep asterisk in the 
callpath, i.e. canreinvite=no, otherwise the RFC2833 DTMF codes will 
only be sent between the end points. If you need to reinvite, then you 
might have to try using SIP-INFO for DTMF instead of RFC2833.

Leo