asterisk users - Nov 2009 - fax standard extension and Playback

Hi,

I would like to implement (with Asterisk 1.6) something like this :
- when you answer a call and a fax is detected by Asterisk, the other party
is forwarded to ReceiveFax application and a pre-recorded message "You are
receiving an incoming fax" is played to the receiving party.

Using fax standard extension, I can handle the first part (forwarding caller
to ReceiveFax app) but I don't know how to play a message to callee.
A suggestion ?

My first idea was to add an h standard extension block along fax standard
extension but as the called party receives both voice and fax calls, I don't
really how I could specifically fax calls within h standard extension block
:

context incoming-calls {
_XXXX => {
     Dial (....);
}
catch fax {
... ReceiveFax();
}
catch h {
... if (fax comes in) {
         Playback();
    }
}


Regards
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