I have a small percentage of inbound calls showing a caller ID of "NULL". Can someone explain why this is shown as the caller ID instead of "Unknown Number"? I have tried to duplicate the issue by calling in from the PSTN with a blocked number, but the phone display still shows "Unknown Number" as I would expect it to. In one instance the caller ID showed "NULL@172.x.x.x (Call Manager IP)" The inbound trunk is an MGCP PRI on a 2911 registered to CM10.
Thanks in advance,
Paul
