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See a list of Audio Conferencing numbers in Skype for Business Online


Skype for Business Online operated by 21Vianet in China will be retired on October 1, 2023. If you haven't upgraded your Skype for Business Online users yet, they will be automatically scheduled for an assisted upgrade. If you want to upgrade your organization to Teams yourself, we strongly recommend that you begin planning your upgrade path today. Remember that a successful upgrade aligns technical and user readiness, so be sure to leverage our upgrade guidance as you navigate your journey to Teams.

Skype for Business Online, excluding the service operated by 21Vianet in China, was retired on July 31, 2021.


For information about Audio Conferencing numbers in Microsoft Teams, see See a list of Audio Conferencing numbers in Microsoft Teams.

When you set up Audio Conferencing for Skype for Business users, you can view the phone numbers that are available to them for audio conferencing. This list will have all of the audio conferencing phone numbers that are available to your organization.

Looking for prices? See [audio conferencing]


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, go to Skype for Business admin center > Voice > Phone Numbers, click Add, and then click 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.

If there is only one phone number available in your organization, it will be used as the default number for all of your users. When multiple phone numbers are available, you can select the default phone number for each user. This default number will be included in Skype for Business meeting invitations.

You can see Set the phone numbers included on invites to change the dial-in phone number for a single user.


Domestic dial-in numbers are dedicated to your organization and are the only ones that can be set as a default phone number. However, international dial-in numbers may be shared across multiple organizations.


We are frequently updating how you can manage features found in Skype for Business Online, so the steps here might be a little different.

To view your audio conferencing phone numbers

  1. Sign in with your work or school account.

  2. Go to the admin center > Skype for Business.

  3. In the Skype for Business admin center, in the left navigation, go to Audio conferencing > Microsoft bridge, and then:

    • You can view the phone numbers that are available for audio conferencing.

    • You can also view the location, and the primary and secondary languages that will be used by the audio conferencing auto attendant.


You can go to Audio conferencing > Users and select the user's properties to change the default number by choosing a new number from the list of available numbers in your organization. See Set the phone numbers included on invites.

Want to know how to manage with Windows PowerShell?

Try or purchase Audio Conferencing in Microsoft 365 or Office 365