I have successfully programmed trunk to trunk transfer for an Emerald ICE pbx. It seems to work well with the exception of the disconnect. When the call is ended by either side, both ports stay open indefinitely. When I call the number that the transfer was on, I get a ring no answer. It sounds like a disconnect supervision issue but since I am a novice on this system, I don't know where to adjust this setting. Please advise. Thanks in advance.