1. From a user account that is a member of the RTCUniversalServerAdmins group (or has equivalent user rights), or is assigned to 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 Conferencing, and then do one of the following:

   1. To create a new user policy, click New, and then click User policy. Create a unique name in the Name field that indicates what the user policy covers (for example, EnableAnonymous for a user policy that enables communications with anonymous users).
      
      
   2. To configure an existing user policy, click the appropriate policy listed in the table, click Edit, and then click Show details.
      
      

4. In the Conferencing Policies dialog box, select the Allow participants to invite anonymous users check box.

5. Click Commit.

6. In the left navigation bar, click Users, search on the user account that you want to configure.

7. In the table that lists the search results, click the user account, click Edit, and then click Show details.

8. In Edit Lync Server User under Conferencing policy, select the user policy with the anonymous user access configuration that you want to apply to this user.

   Note:
   The <Automatic> settings apply the default server installation settings and are applied automatically by the server.

To enable users to invite anonymous users to conferences, you must also enable support for anonymous users in your organization. For details, see Enable or Disable Anonymous User Access for Your Organization in the Deployment documentation or the Operations documentation.