• The existing Exchange recipient is enabled for Unified Messaging. For detailed steps, see Enable a User for Unified Messaging.
  
  
• A UM dial plan has been created. For detailed steps, see Create a UM Dial Plan.
  
  
• A UM mailbox policy has been created. For detailed steps, see Create a UM Mailbox Policy.
  
  
• The extension number that will be assigned to the UM-enabled user is valid according to the UM dial plan associated with the 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. In the console tree, navigate to Recipient Configuration > Mailbox.
   
   
2. In the result pane, select the mailbox for which you want to add an extension number.
   
   
3. In the action pane, under the mailbox name, click Properties.
   
   
4. In <Mailbox User> Properties, click the E-Mail Addresses tab.
   
   
5. Click the drop-down arrow located next to Add, and then click EUM Address. In UM Address (Extension), in the Address/Extension box, type the extension number.
   
   
6. In the Dial plan (Phone context) box, click Browse to locate the dial plan for the user.
   
   
7. Click Apply, and then click OK.
   
   

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.

This example adds an extension number for Tony Smith, a UM-enabled user.

	Copy Code
$mbx=Get-Mailbox tony.smith $mbx.EmailAddresses +="eum:22222;phone-context=MyDialPlan.contoso.com" Set-Mailbox tony.smith -EmailAddresses $mbx.EmailAddresses

For more information about syntax and parameters, see Set-Mailbox or Get-Mailbox.

After you add an extension number, you may also want to:

• Modify an Extension Number for a UM-Enabled User
  
  
• Remove an Extension Number for a UM-Enabled User