atcomsystems.ca/forum Forums Other TDM Phone Systems Sprint - Tadiran Telephones & Systems Anyone have IP UGW behind firewall?

I have to agree with Coral Tech in saying that it is probably being blocked by the firewall. If you get the phone going 2427 is setup correct. What you are missing is the media gateway to make the conversion from IP to TDM. You need to open UDP ports 16400 through 16490. When that is completed you should have voice in both directions.