Hello,

I’m giving PJSIP a try on an Asterisk 13 box. More specifically I’m studying in a lab, how to configure T.38.

My setup is:
SendFAX –>– asterisk 11 <----SIP/PJSIP---> asterisk 13 –>– ReceiveFAX

I can observe fax are successfully sent end received but I’m failling to see any T.38 trafic.

My understanding of T.38 is that closest to receiving end gateway should trigger T.38 negociation. So I would expect the second asterisk box (the one with Asterisk 13) to ask the first asterisk box to start using T.38.

Is this expectation correct ?
Is there a way to “force” ReceiveFAX to use T.38 ?

Best Regards