Cisco 2821-V with 1 Pri E1 connecting to/from Pstn.
Fax-Relay T38 connection to Fax Server without problem ...
I've performed IOS upgrade for other reason and all fax stop working in/out
I'm not finding what's change into new IOS release ..
Please help me ?
Follow the troubleshooting guide for the Fax Relay. I hope it may help you :