Previously we were using MGCP on our gateway to our CUCM but then had to switch to H.323. Faxes were working great with MGCP and we didn't change anything else other than the gateway to CUCM protocol. Now we seem to be experiencing fax issues and we've been troubleshooting this with TAC for over a week now and have run out of ideas. With MGCP we received faxes from these same companies for months. Here's our setup:
We are trying to pass everything through to our fax machine without touching it.
Attached are the configs for the 3825 and VG224 in question. At this time all calls are coming from the single PRI on the 3825 but the behavior exists on multiple fax machines on multiple VG224s throughout our campus.
Does anyone have any "real world" experience with this and why it could be failing? We are pulling our hair out!! Thanks!