1. From a user account that is assigned to the CsUserAdministrator role or the CsAdministrator role, log on to any computer in your internal deployment.

2. Open a browser window, and then enter the Admin URL to open the Lync Server Control Panel. For details about the different methods you can use to start Lync Server Control Panel, see Open Lync Server Administrative Tools.

3. In the left navigation bar, click Users.

4. In the Search users box, type all or the first portion of the display name, first name, last name, Security Accounts Manager (SAM) account name, SIP address, or line Uniform Resource Identifier (URI) of the user account that you want to enable, and then click Find.

5. In the table, click the user account that you want to enable for Enterprise Voice.

6. On the Edit menu, click Show details.

7. On the Edit Lync Server User page, under Telephony, click any option except Enterprise Voice.

   Note:
   To restrict a user from making audio or video calls by using Lync, under Telephony, click Audio/video disabled.

8. Click Commit.

The user is now unable to use the Enterprise Voice feature.