CUCM only provides this natively: Cisco IP Phone Address Book Synchronizer enables users to synchronize their Microsoft Windows Address Book with the Cisco Personal Address Book. Install this plug-in on all Windows operating system computers for Users who desire to synchronize their Windows Address Book with their Cisco Unified Communications Manager Personal Address Book.
If you want to sync from Outlook into CUCM, you would need to build something in-house to do that.
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