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MS Teams - Assign Numbers For CallTower


This article is intended for CallTower Teams Direct Routing customers who do not have a service/admin account for 365 in CallTower Connect. The user must be created in CallTower Connect and assigned a phone number prior to performing these steps in the Teams Admin Center.

Login into the Teams Admin Center as a 365 Global Administrator or Teams Administrator:

On the left-hand side click on Users>Manage users

Search for the user that needs to have a direct routing number added and click on the Display name


Under the Account tab click Edit next to General information


Add the phone number to the assigned phone number field in the format shown below with the 1 in front and then click Apply

To Remove the number just blank out the Assigned phone number field then click Apply


This message will pop up , click Wait


Click on Policies and then click Edit next to Assigned policies


Scroll down to Voice routing policy and drop down to select CallTower Route then click Apply.

To remove the voice routing policy drop-down, select Global then click Apply.


PowerShell Cmdlets to remove numbers and assign numbers

(These instructions apply to Teams Direct Routing Commercial without Service Account)

You must connect to the Microsoft Teams PowerShell Module using a 365 Global Administrator or Teams Administrator account.

To remove the number from the user

To add the number to the user

  • Set-CsPhoneNumberAssignment -Identity  -PhoneNumber +18015551212 -PhoneNumberType DirectRouting
  • Grant-CsOnlineVoiceRoutingPolicy -Identity -PolicyName "CallTower Route"


GCC High Powershell Cmdlets:

Important Note: This section only applies to GCC High O365 Tenants all commercial tenants should use the section above.

To add the number to the user:

  • Set-CsUser -Identity -URI tel:+18015551212 -EnterpriseVoiceEnabled $true -HostedVoiceMail $true
  • Grant-CsOnlineVoiceRoutingPolicy -Identity -PolicyName "CallTower Route"

To remove the number from a user:

To add the number to a resource account

  • To add a phone number to a resource account you need to reference the proper application ID depending on if the resource account is for an auto attendant or a call queue. Insert one of the application IDs below into the command at the bottom.

"Auto Attendant" = "ce933385-9390-45d1-9512-c8d228074e07"
"Call Queue" = "11cd3e2e-fccb-42ad-ad00-878b93575e07"

  • Set-CsOnlineApplicationInstance -Identity -OnpremPhoneNumber tel:+18015551212 -ApplicationId [Insert Application ID Here]


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