Users cannot use Office Communications Server until they are enabled for Office Communications Server service. After you have synchronized Active Directory for users, groups, and contacts across all your forests, enable the contacts that you created in the central forest for Office Communications Server.
If all contacts have an e-mail address that corresponds to their SIP address, you can enable all contacts simultaneously. If all contacts do not have an e-mail address that corresponds to their SIP address, or if you want to host these users on different servers or pools, configure each contact individually.
To enable all contacts for Office Communications Server
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In the central forest, log on to Office Communications Server 2007 R2 as a member of the RTCUniversalUserAdmins group.
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Start Active Directory Users and Computers: Click Start, point to All Programs, point to Administrative Tools, and then click Active Directory Users and Computers.
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Go to the organizational unit where you created your contacts.
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Select all contacts, right-click the highlighted area, and then click Enable users for Communications Server.
To enable an individual contact for Office Communications Server
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In the central forest, log on to Office Communications Server 2007 R2 as a member of the RTCUniversalUserAdmins group.
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Start Active Directory Users and Computers: Click Start, point to All Programs, point to Administrative Tools, and then click Active Directory Users and Computers.
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Go to the organizational unit where you created your contacts.
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Right-click the contact that you want to enable, click Properties, and then click the Communicationstab.
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Select the Enable user for Office Communications Servercheck box.
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In the Sign-in namebox, type the sign-in name (also known as the SIP URI) for this contact and select the SIP domain that is used by your Office Communications Server server. For example, Dylan@contoso.com.
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In Server or pool,select the Office Communications Server pool where you want to host the contact.