We would like to get to a point where t.38 faxing is supported on all of our MGCP gateways. We seem to keep hiting bugs that make such a deployment difficult at best.
Two problems we have run into:
causes mgcp configuration be be cleared anytime a new config is pulled from Call Manager via either a reload or the ccm-manager config command. Bug was supposed to be resolved by CUCM 7.1.2 but still seeing issue with 22.214.171.12400-5 and CME IOS 12.4(24)T2.
Second major issue:
CSCsy29533 - MGCP T38 Fax Relay is disabled even when it is configured.
have not been able to retest with CME IOS 12.4(24)T2 or 15.0.1M.
Does anyone have a environment where T.38 is working reliably?