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Beginner

CUPC Caller ID Unknown

Customer is running CUCM version 7.1.3 and Presence 8.6 . All the basic CUPS functions are working as it should be except one thing when ever an outbound PSTN call from CUPC is made caller ID is not going through,  reciever shows the calling number as "Unknown" . This happens in both Softphone and Deskphone mode. I know it uses Application Dial Rules to dial out but not sure how to pass this Caller ID. Thanks for your help in Advance.

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