I am using Trixbox 2.6 , Asterisk 1.4 with FreePBX 2.4.
My setup includes a SIP telephony provider (wich use T38 for faxing), and lots of ATAs (T38 activated)
Now, I want to activate the T38 passtrough to be able to fax.
T38-SIP-provider <====> Asterisk <====> T38-ATA
However, it does not seems to work "out of the box", and I do not know of any options to set the passtrough behaviour.
I have seen some info there and there, but nothung clear, and some howtos included messing into sip_additional.conf SIP extension's config, a thing FreePBX wans not to do.
Have I missed something?
How can one activate the asterisk 1.4 + T38 fax passtrough ?