Set the Audio Conferencing phone numbers for meeting organizers that are included on invites

Audio Conferencing in Office 365 enables users in your organization to create Skype for Business and Microsoft Teams meetings, and then allow users to dial in to those meetings using a phone. In Office 365, you have the option of using a Microsoft audio conferencing bridge or a third-party audio conferencing bridge that is hosted by an approved audio conferencing provider (ACP).

Notes: 

  • There isn't a resource that contains a listing of all of the dial-in numbers for Audio Conferencing. If you are looking to see if there are dial-in phone numbers available in your area or country/region, use the Skype for Business admin center > Voice > Phone Numbers, click Add then New Service Numbers. Use the lists for Country/Region, State/Region and City to filter your search.

  • Also, if you are looking for toll free service numbers, select Toll-Free from the State/Region list.

A conferencing bridge gives you a set of dial-in phone numbers for your organization. All of them can be used to join the meetings that a meeting organizer has created, but you can select which ones will be included on their meeting invites.

Note: There can be a maximum of one toll and one toll-free phone number on the meeting invite for a meeting organizer, but there is also a link located at the bottom of each meeting invite that opens the full list of all dial-in phone numbers that can be used to join a meeting.

Setting the default dial-in phone number for a meeting organizer

  1. Sign in to Office 365 with your work or school account.

  2. Choose Admin centers > Skype for Business.

  3. Choose Users.

    Shows selecting users in the Skype for Business admin center

  4. Choose the users you want to edit:

    • To select a single user, select the user’s name.

    • To select all users on the page, select the box next to Display name at the top of the list.

    • To select multiple users, select the box next to each user's name.

  5. In the right panel, choose Edit.

    Choose the edit icon.

  6. Choose Audio conferencing.

  7. On the Properties page, in the Provider name list, choose the provider for the user. Depending on the provider, complete the following boxes.

    • Microsoft is the provider: Use the Default toll number and Default toll-free number lists to select the default numbers for the user.

      Note: At least one toll-free number must be assigned to your conferencing bridge before it can be set as the default toll-free number of a user. To get a toll-free number, see Getting service phone numbers for Skype for Business and Microsoft Teams.

    • A third-party is the provider: Use the Toll number and Toll-free number fields to enter the numbers for the user.

Reset audio conferencing phone numbers

  1. In the Skype for Business admin center, choose Audio conferencing.

  2. At the top of the page, choose Users.

  3. Choose the users you want to reset, and then in the Action pane, click Clear.

By default, when you change a user's conferencing settings, an email is sent to the user. To change this, see Enable or disable sending emails when Audio Conferencing settings change.

Important: When you change a user's audio conferencing settings, recurring and future Skype for Business and Microsoft Teams meetings must be updated and sent to attendees.

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   +180045551234
  • 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.

    Set-CsOnlineDialInConferencingUserDefaultNumber -FromNumber +18005551234 -ToNumber +18005551239 NumberType TollFree -BridgeId <Bridge Id> -RescheduleMeetings 
    • To set the default toll-free number for all users without one to +18005551234, run:

      Set-CsOnlineDialInConferencingUserDefaultNumber -FromNumber $null -ToNumber +18005551234 -NumberType TollFree -BridgeId <Bridge Id>  
    • To change the default toll-free number of all users that have +18005551234 as their default toll-free number to +18005551239, run:

      Set-CsOnlineDialInConferencingUserDefaultNumber -FromNumber +18005551234 -ToNumber +18005551239 NumberType TollFree -BridgeId <Bridge Id>
    • To set the default toll-free number of all users located in the U.S. to +18005551234, run:

      Set-CsOnlineDialInConferencingUserDefaultNumber -Country US -ToNumber +18005551234 -NumberType TollFree -BridgeId <Bridge Id>

Related Topics

Set up Audio Conferencing for Skype for Business and Microsoft Teams

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