I have a 3825 Router with CallManager 4.13 with MGCP.
I'm having an issue with my 1 fax machine. I can receive fax, but cannot sent out fax. Getting fast busy. It feels like it is a route pattern issue, but I cannot figure it out. I have a default 9.@ pattern. The fax machine is connected to an fxs port 0/0/0. I have a translation pattern with 777 to go to this fax machine port vie H.323 gatway pointing to the router itself. From the fax machine, I can call internal numbers without any issue, just external numbers that it is having issue. I've also tried using the T.38 fax relay, but it only address receiving fax, not sending.
Also, I've looked at this below document for MGCP.
Neither of these seems to fix my issue. Please help, or if anyone can suggest a working solution with similar scenario, that would be great. Thanks