You support a customer whose network environment includes Microsoft Lync Server 2013 Enterprise
Voice deployed at two sites named Sitel and 5ite2. All users require extension dialing. Only direct
inward dialing will be used for auto attendants or response groups. The extension numbers in fourdigit format are stored in the telephoneNumber attribute on the users’ Active Directory Domain
Services (AD DS) account. Sitel uses 2xxx extensions, and Site2 uses 3xxx extensions. You want to
retain the four-digit extensions in Active Directory, but also present the numbers as valid numbers in
the Lync 2013 client. You need to ensure that four-digit dialing normalizes properly in the address
book for Lync. What should you do?

A.
In the Lync Control Panel, under voice routing and dial plan, modify the global dial plan to add the
following rules: ^(2\d{3})$ — +15197778888;ext=$1^(3\d{3})$ — +14163334444;ext=$1

B.
Modify the Company_Phone_Number_Normalization_Rules.txt file and add the following rules:
^(2d\{3})$ — +15197778888;ext=$1^(3d\{3})$ — +14163334444;ext=$1

C.
Modify the Company_Phone_Number_Normalization_Rules.txt file and add the following rules:
^(2\d{3})$ — +15197778888;ext=$1^(3\d{3})$ — +14163334444;ext=$1

D.
Use absconfig.exe from the Lync Resource Kit and change the flag of telephoneNumber to be
included in the address book generation.