Applies to: Exchange Server 2010 SP3, Exchange Server 2010 SP2

Topic Last Modified: 2011-03-19

There are specific scenarios in which you may need to move a user who is enabled for Unified Messaging (UM) to a different UM dial plan or to change the dial plan that's associated with the UM-enabled user. For example, if you want to move a UM-enabled user from a Telephone Extension to a SIP URI dial plan or if you have a Microsoft Exchange Server 2010 organization that's integrated with Microsoft Office Communications Server 2007 but the Mediation Server is down, you'll have to disable the user for Unified Messaging and then enable the user for Unified Messaging on the new UM dial plan. This is because different dial-plans may have different settings and requirements, such as different extension length, different URI type. For example, a SIP URI dial plan requires a SIP Resource Identifier to be assigned to each UM-enabled mailbox, but Telephone Extension dial plans don’t. Also, each UM mailbox contains references to both the UM dial plan and UM mailbox policy. The UM mailbox policy, in turn, also contains references to the UM dial plan. If you change the primary proxy address for a UM-enabled user to point to a different dial plan, the UM mailbox is now in an inconsistent state.

Although it's possible to add a secondary EUM proxy address with a secondary dial plan for a UM-enabled user, the user can receive new voice mails on the secondary dial plan. Adding a secondary EUM proxy address is designed to support call answering scenarios only when a user has two phones, for example, a Unified Communications and a legacy PBX phone, but wants all their voice mails to be sent to the same Exchange 2010 mailbox. However, adding a secondary EUM proxy address for a UM-enabled user when you're changing the primary UM dial plan that's associated with a UM-enabled user isn't a supported configuration.

Looking for other management tasks related to UM users? Check out Managing Unified Messaging Users.


Change the UM Dial Plan for a UM-enabled User

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "UM mailboxes" entry in the Unified Messaging Permissions topic.

  1. Create the new dial plan that be used. For detailed steps, see Create a UM Dial Plan.

    If you're migrating UM-enabled users without Office Communications Server 2007to an integrated Communications Server 2007 environment, you must first create a SIP URI dial plan.
  2. Disable the UM-enabled user for Unified Messaging. For detailed steps, see Disable Unified Messaging for a User.

  3. Enable the user for Unified Messaging on the new dial plan. For detailed steps, see Enable a User for Unified Messaging.

If you are moving users to an environment with Office Communications Server 2007, you must also include a SIP Resource Identifier for the user when you enable the user for UM. You must also select the UM mailbox policy that's associated with a SIP dial plan.

Other Tasks

After you change the UM dial plan for a UM-enabled user, you may also want to: