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Caller ID shows "NULL" on intermitant inbound calls

pjsooner7
Beginner
Beginner

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

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