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


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