I had a customer with a UX5000 change phone service providers a couple months ago. Really didn't change a thing on the UX Programning - just was on site to make sure the transition went smoothly.

Everything went as hoped, except since the change - call forward off-premise does not work properly. A few users forward their desk sets to cell phones on this system. If an outside call comes into the operator and is transferred to their extension, it works fine. But, if the call come in directly on their DID - the caller gets a fast busy, or an "all circuits busy" from the network message.

I verified that none of the programming has changed - I'm stumped.