If you do not define phone numbers in E.164 format for each user in your Active Directory, you must perform other actions to ensure that the numbers in your Active Directory are processed into the Office Communications Server (OCS) address book in a form that Cisco Unified Communications Manager dialing rules can process to dial a number.
If all the numbers in your Active Directory are in E.164 format, you do not need to configure OCS normalization rules. This is the easiest way to deploy Cisco UC Integration for Microsoft Office Communicator.
If the numbers in your Active Directory are not in E.164 format, then you must configure OCS normalization rules to ensure that Microsoft Office Communicator downloads E.164-formatted numbers from OCS.
This is necessary because OCS requires E.164-formatted numbers, unless you configure normalization rules. For information about this topic, see the following URL: