I have a translation pattern xlat'ing a DID # to an external fax # with the called party transform mask set to 9xxxxxxxxxx (local # so no preceding 1 is necessary). Doubt it matters but the fax machine is in the same physical location as the gateway, but the cucm cluster is remote. The fax line is a POTS plugged directly into the fax machine.
Anyways, they just started experiencing an issue where they can make outbound faxes fine. Inbound faxes look okay but are not completing. They see the fax machine pick up the incoming call but the sending fax reports a failed send. The fax machine has an attached handset and 2 way calls are fine in both directions. It's just incoming faxes that don't work when people fax to the DID translated to the external fax #.
There are actually 2 DID translations to 2 fax lines with this same setup and they replaced 1 of the fax machines so it's not a physical fax machine issue. The 2 POTS lines are each with a different carrier, so it's not a carrier issue.
Any ideas on how to troubleshoot this will be much appreciated.
Most common problems for faxes failing:
-Slips on your T1's (show controllers t1, use network-clock-select 1 t1 0/0/0 if slips)
-packet loss ('show call active voice brief | i lost' should show 0/0/0 for all calls
-your configuration isn't correct. I suggest this for all non-mgcp gateways:
voice service voip
fax protocol none
modem passthrough nse codec g711ulaw