Here is the setup:
POTS -> PRI -> Asterisk -> ATA (Fax)
The ATA is set to only 711. Asterisk's sip.conf sets this device to only 711. Yet, faxing works less than 50% of the time.
I have a couple of different fax arrangements with Asterisk.
POTS -> Asterisk (X100P) -> ATA -> Fax Modem (HylaFAX)
Probably the *only* reason I can get anything through this arrangement reliably is due to the Class 1 ECM support of HylaFAX. I see lots and lots of ECM frame data errors, and the sender has to resend them, and the faxes take longer than they should. There are still often problems due to a lack of synchronicity between the sender and the receiver, but most of the time everything works out.
POTS -> PRI -> Asterisk (TE405P) -> Patton T1 Fax Card (HylaFAX)
This is a nearly flawless arrangement when receiving. I don't have any problems with it, at least to any extent that I've noticed yet.
The only real difference that I can see in this scenario is that there is some A->D/D->A conversion that is probably going on probably both on the ATA and on Asterisk, and somewhere in that process it's being done badly.
Will going thru a router that supports T.38 help? I don't see how since Asterisk doesn't talk T.38.
T.38 is supposed to be the end-all happy solution to FoIP, but Asterisk does not yet support T.38.
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