Remove an E.164 number
When you enable a user for UM and link them to an E.164 dial plan, two EUM proxy addresses are created. One contains the user's extension number and the other contains the E.164 number for the user. The extension number is used when the user calls in to an Outlook Voice Access number.
You can remove the primary E.164 number that was added when the user was enabled for UM or a secondary E.164 number that was added later, along with the EUM proxy addresses for the user. The primary E.164 number you added when the user was enabled for UM will be listed as the primary EUM proxy address. Any additional E.164 numbers you added will be listed as secondary EUM proxy addresses. When an E.164 number is removed, callers can no longer leave voice mail for the user at the E.164 number that was removed.
If you remove the primary E.164 number, UM won't be able to send voice mail to the user's mailbox and call answering rules won't be processed. After you remove the primary E.164 number, the EUM proxy address for the user will be listed as Null on the user's mailbox in the EAC and when you run the Get-Mailbox cmdlet in Exchange Online PowerShell. Also, when you run the Get-UMMailbox cmdlet, the Extensions, PhoneNumber, and CallAnsweringRulesExtensions parameters will be blank or null.
You can use the EAC or Exchange Online PowerShell to remove a primary or a secondary E.164 number for a user. You can use the Email Address page on the user's mailbox in the EAC to remove a primary or a secondary E.164 number. You can't use the UM Mailbox page in the EAC to remove a primary or secondary E.164 number.
You can view the primary and secondary E.164 numbers for a user by using the Get-UMMailbox cmdlet or the Get-Mailbox cmdlet in Exchange Online PowerShell.
For additional management tasks related to users who are enabled for voice mail, see Voice mail-enabled user procedures.
What do you need to know before you begin?
Estimated time to complete: 3 minutes.
You need to be assigned permissions before you can perform this procedure or procedures. To see what permissions you need, see the "UM mailboxes" entry in the Unified Messaging Permissions topic.
Before you perform this procedure, confirm that an E.164 UM dial plan has been created. For detailed steps, see Create a UM dial plan.
Before you perform this procedure, confirm that a UM mailbox policy has been created. For detailed steps, see Create a UM mailbox policy.
Before you perform these procedures, confirm that the user's mailbox has been enabled for UM and linked to an E.164 dial plan. For detailed steps, see Enable a user for voice mail.
Before you perform these procedures, confirm that the primary and secondary E.164 numbers are configured for the user.
For information about keyboard shortcuts that may apply to the procedures in this topic, see Keyboard shortcuts for the Exchange admin center.
Use the EAC to remove the primary or a secondary E.164 number
In the EAC, navigate to Recipients > Mailboxes.
In the list view, select the mailbox from which you want to remove an E.164 number, and then click Edit .
On the User Mailbox page, under Email address, select the E.164 number that you want to remove from the list, and then click Delete . The primary EUM proxy address or E.164 number is listed in bold letters and numbers.
Use Exchange Online PowerShell to remove the primary or a secondary E.164 number
This example removes the E.164 number +14255551010 from the mailbox of Tony Smith, a UM-enabled user.
Before you remove an E.164 number using Exchange Online PowerShell, you need to determine the position of the EUM proxy address that you want to modify. To determine the position, use the $mbx.EmailAddresses command. The first EUM proxy address in the list will be 0.
$mbx = Get-Mailbox tony.smith $mbx.EmailAddresses.Item(1) -="eum:+14255551010;phone-context=MyDialPlan.contoso.com" Set-Mailbox tony.smith -EmailAddresses $mbx.EmailAddresses