Anyone attempt to make this type of WAN connection? I assume it would need to be a non-Gatekeeper controlled ICT? Is it as simple as pointing the ICT to the IP address of the Nortel PBX? Any tips or comments are greatly appreciated!

I have one user that intermittently receives the above popup when attempting to open a UM. He can listen to the message through the phone and he can forward the message and it can then be opened. We are running Unity 4.0(4) and Exchange 2003. Any ...