On Tue, 7 Dec 2004, Lee Howard wrote: > On 2004.12.07 10:06 Matthew Boehm wrote: > > 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.
An extra a-d-a conversion step will cause problems. Running a fax over voip even more so most of the time. The timing is not locked end-to-end and while this may be acceptable for voice it is a big problem for data. > 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. Here you have an all digital path, with clocking locked end-to-end, or at least from the remote central office all the way to your fax card. Peter _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users