I think I have one that will stump most of you; I have ICS 4.1 system with a PRI programmed for NI2. When I forward a desk phone to a cell phone and 4 digit dial that ext. from another set on the system the call is forwarded out of the switch correctly and call is completed to the cell phone. But when I call that ext. using the full number example 788-3770 the call is forwarded out of the switch then hits the mobile with one ring and then goes to a fast busy. Does anyone have suggestions. It seems like it may the message format is being sent from the siwthc but I'm not sure.