Assign or unassign toll and toll-free phone numbers to a dial-in conferencing bridge

When you buy Skype for Business PSTN Conferencing licenses for your organization, Microsoft is hosting a conferencing bridge for your organization. The conferencing bridge gives out dial-in phone numbers from different locations so meeting organizers and participants can use a dial-in numbers to join meetings using a phone.

In addition to the phone numbers already assigned to your conferencing bridge, you can get additional service numbers (toll and toll-free numbers used for dial-in conferencing) from other locations and then assign them to the conferencing bridge so you can expand the area/country/region coverage for you users. See Getting Skype for Business service phone numbers.

Note: To be able to assign/unassign a phone number for a conferencing bridge, the phone number must be a 'service' number. You can see the type of number it is by using the Phone numbers tab and look under the Number type column.

Assign a service phone number to a conference bridge
  1. Sign in to Office 365 with your work account.

  2. Go to the Office 365 admin center > Admin centers > Skype for Business > Voice > Phone numbers and find the phone number.

  3. Select the phone number from the list and in the Action pane, click Assign.

  4. On the Assign page, click Save.

    Only a service toll number can be set as the default number for your conferencing bridge, service toll-free numbers can’t be set as the default number of your conferencing bridge. If you are assigning a service toll number and you would like to set it as the new default number for your conferencing bridge, check Use this number as the default.

    Note: After a new phone number has been assigned, even if the number became the new default number, the default number for existing users won't change. To set the default toll or toll-free number that is added to an organizer's meeting invites, see Set the phone number that will be used when users join a meeting.

Unassign a phone number from a conference bridge
  1. Sign in to Office 365 with your work or school account.

  2. Go to the Office 365 admin center > Admin centers > Skype for Business > Voice > Phone numbers and find the phone number.

  3. Select the phone number from the list and in the Action pane, click Unassign.

  4. In the Are you sure you want to unassign this number? window, click Yes.

    Important: Once a phone number is unassigned from a conferencing bridge, the phone number will no longer be available for users to join new or existing meetings.

    Remember to change the default number for any users that are already using it and set as it to a different one. This is because the old number (that doesn't work) will continue to be included on new meetings invites if it’s set as the default number and if it hasn’t been updated.

    To modify the default toll or toll-free number for a user, see Set the phone number that will be used when users join a meeting.

Want to know how to manage with Windows PowerShell?

  • To save time or automate this, you can use the Set-CsOnlineDialInConferencingUser cmdlet.

    • Use the Set-CsOnlineDialInConferencingUser cmdlet to change the default toll or toll-free number for specific users.

      • To change the default toll-free number for a user, run:

        Set-CsOnlineDialinConferencingUser –Identity amos.marble@Contoso.com -TollFreeServiceNumber   80045551234
    • Use the Set-CsOnlineDialInConferencingUserDefaultNumber cmdlet to change the default toll or toll-free number of users based on their original default number or their location.

      Note: To find the BridgeID, use the Get-CsOnlineDialInConferencingBridge.

    • To set the default toll-free number for all users without one to 8005551234, run:

      Set-CsOnlineDialInConferencingUserDefaultNumber -FromNumber $null -ToNumber 8005551234 -NumberType TollFree -BridgeId <Bridge Id>  
    • To change the default toll-free number of all users that have 8005551234 as their default toll-free number to 8005551239, run:

      Set-CsOnlineDialInConferencingUserDefaultNumber -FromNumber 8005551234 -ToNumber 8005551239 NumberType TollFree -BridgeId <Bridge Id>
    • To set the default toll-free number of all users located in the U.S. to 8005551234, run:

      Set-CsOnlineDialInConferencingUserDefaultNumber -Country US -ToNumber 8005551234 -NumberType TollFree -BridgeId <Bridge Id>

      Note: The location that is used above needs to match the contact information of user(s) that is set in the Office 365 admin center.

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