Mask phone numbers in Microsoft Teams meetings

For added privacy, the phone numbers of participants who dial in to a Teams meeting using audio conferencing are fully displayed to the internal participants. The numbers are masked from the participants outside of your organization. This setting is the default for all organizations. The masked number is displayed as shown in the following image:

an example of a masked phone number.

For specific industry use cases, admins have the ability to choose how the audio conferencing participants' phone numbers appear in meetings that are organized in their tenant. The admins can choose from three options:

  • Phone numbers are masked only from external participants. The participants who belong to the meeting organizer's tenant still see the full phone number.
  • Phone numbers are masked from everyone in the meeting except the organizer.
  • Phone numbers are unmasked, which makes them visible to everyone in the meeting.

This setting is applied to all the surfaces in the meeting where phone numbers are exposed.

Use Teams admin center to set phone-number masking

To change the Public Switched Telephone Network (PSTN) masking setting in the Teams admin center, log into the Teams admin center as an administrator, select Meetings > Conference Bridges in the left-hand navigation panel, and then select Bridge settings. Display masked caller IDs is a dropdown at the bottom of the Bridge settings pane, and it will allow you to choose the following:

  • To participants outside your organization
  • To all meeting participants
  • Disabled

Use Microsoft PowerShell to set phone-number masking

To change the PSTN masking setting in PowerShell, set the MaskPstnNumbersType parameter of the Set-CsOnlineDialInConferencingTenantSettings cmdlet to one of the available options.

To mask phone numbers only from external participants, run the following command:

Set-CsOnlineDialInConferencingTenantSettings -MaskPstnNumbersType "MaskedForExternalUsers"

To mask phone numbers from all participants in the meeting (except the organizer), run the following command:

Set-CsOnlineDialInConferencingTenantSettings -MaskPstnNumbersType "MaskedForAllUsers"

To disable phone number masking, run the following command:

Set-CsOnlineDialInConferencingTenantSettings -MaskPstnNumbersType "NoMasking"