[asterisk-users] What requires ReceiveFAX to trigger T.38 negociation ? [SOLVED]

Olivier oza.4h07 at gmail.com
Mon Apr 25 10:41:03 CDT 2016

2016-04-22 12:41 GMT+02:00 Olivier <oza.4h07 at gmail.com>:

> 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
I don't exactly understand what happened but I could positively observe
successfull T.38 negociation today in the above setup.

For reference, the dialplan in Sender machine should include a
Set(FAXOPT(gateway)=yes) statement while it should include
Set(FAXOPT(gateway)=no)  on Receiver side.

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