How to Configure an Extension Number on a Unified Messaging Auto Attendant

Microsoft Exchange Server 2007 will reach end of support on April 11, 2017. To stay supported, you will need to upgrade. For more information, see Resources to help you upgrade your Office 2007 servers and clients.


Applies to: Exchange Server 2007, Exchange Server 2007 SP1, Exchange Server 2007 SP2, Exchange Server 2007 SP3

Topic Last Modified: 2007-08-18

This topic explains how to use the Exchange Management Console and the Exchange Management Shell to configure an extension number or multiple extension numbers on a UM auto attendant in Microsoft Exchange Server 2007 Unified Messaging (UM). When you add an extension number to a UM auto attendant, that number can be used by callers to access the auto attendant. Also, in some organizations, you may have to add extension numbers because there is more than one extension number that can be used by callers to access an auto attendant. However, by default, no extension numbers are configured when you create an auto attendant.

An extension number for a UM auto attendant is also known as a pilot identifier or pilot number.

You can create a new auto attendant without configuring an extension number for the auto attendant. You can also associate more than one telephone or extension number with a single auto attendant. You can either add the extension numbers when you create the UM auto attendant or add them after you have configured the auto attendant. The number of digits in the extension number you configure on the UM auto attendant must match the number of digits for an extension number that is configured on the UM dial plan that is associated with the UM auto attendant.

You can also add a Session Initiation Protocol (SIP) address instead of adding an extension number. A SIP address is used by some IP PBXs.

To perform this procedure, the account you use must be delegated the Exchange Organization Administrator role.

For more information about permissions, delegating roles, and the rights that are required to administer Exchange Server 2007, see Permission Considerations.

Also, before you perform these procedures, confirm the following:

  • A UM dial plan has been created.

  • A UM mailbox policy has been created.

  • A UM auto attendant has been created.

  1. In the console tree of the Exchange Management Console, expand the Organization Configuration node.

  2. Click Unified Messaging.

  3. In the work pane, click the UM Auto Attendants tab.

  4. Select the auto attendant that you want to modify, and then, in the action pane, click Properties.

  5. On the General tab, under Extension number to associate, enter the number you want to associate with this auto attendant, and then click Add.

  6. Click OK to save your changes.

  • Run the following command:

    Set-UMAutoAttendant -Identity MyUMAutoAttendant -PilotIdentifierList "12345, 72000, 75000"

For more information about syntax and parameters, see Set-UMAutoAttendant.

For more information about UM auto attendants, see the following topics: