Tech Note:
Whether Corporate phone book is available across all Unified Communication end devices?
Yes, Corporate phone book is available across all devices, Desk phone, Soft phone and Mobile clients. This can be achieved by integrating with a corporate LDAP directory in a enterprise network to enable access for Cisco Unified Communications endpoints.
Cisco Unified Communications Manager can be integrated with Corporate directory allows for user provisioning and authentication with a corporate LDAP directory. By default, Cisco Unified IP Phones are configured to perform user lookups against Unified CM's embedded database. However, it is possible to change this configuration so that the lookup is performed on a corporate LDAP directory.
Refer this document for Directory integration with Unified CM,
LDAP Directory Integration Configuration guide
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