To ensure that contact data in your directory server is replicated to Cisco Unified Communications Manager, you must synchronize with the directory server. Before you can synchronize with the directory server, you must enable synchronization.
Open the Cisco Unified CM Administration interface.
The LDAP System Configuration window opens.
Locate the LDAP System Information section.
Select Enable Synchronizing from LDAP Server.
Select the type of directory server from which you are synchronizing data from the LDAP Server Type drop-down list.
What to do next
Specify an LDAP attribute for the user ID.