FAX: ISDN - Fax machine

Greetings everyone.

I wonder if anyone can help me bridging faxes from a ISDN BRI line to a FAX machine (and vice versa).

I’m supposing it should be something like this in extensions.conf:

exten => fax,1,Dial(Zap/2)

But this doesn’t seem to work.

Thanks in advance,
psantos