I have a BCM 450 with the expansion module. We run both IP and TDM sets on it. I recently had to move some extension to another part of our building. Of the 4 extension that were moved one will not function. However according to my cable testers the line is up correctly, no crossed wires. The line tones back to the system just fine. It will not turn on a phone. I have tried new 7310's as well as 7324's so I know its not the phones. Has anyone else come across this? Thanks.