How to change dial in conferencing number for SfB/Teams users

Picture the scenario where you need to change the default dial-in conferencing number for only part of the users within a tenant. That’s fine to do it manually if the numbering does not exceed 5-10 users, but we, IT guys, are lazy, so we’re going to do it from PowerShell anyway.

Needless to say that as pre-requisites you’ll have to have preferrably a Global Admin account and the Skype for Business Online Module for Powershell up and running:

First, make sure you have the Skype Online Connector installed. Get it from here.

Now, once the connector is installed on your machine, you can run all 4 lines at once in your PowerShell:

$credential = get-credential
Import-Module SkypeOnlineConnector
$lyncSession = New-CsOnlineSession -Credential $credential
Import-PSSession $lyncSession

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Now, we need a common attribute to collect in a variable all users for which we want to change the default Dial-in Conferencing number. In my lab, i’ve done this by querying the old number which I want to replace:

$user1 = Get-CsOnlineDialInConferencingUser | Where-Object {$_.ServiceNumber -ieq “old number here”}

Just to make sure we’re on the right track, we can call out the variable in order to check it’s contents.

Next step is to do a foreach loop here, changing the Dial-in Conferencing number for each object caught in our variable:
$user1 | foreach {Set-CsOnlineDialInConferencingUser -Identity $_.sipaddress -ServiceNumber “new number here”}


We have just sucesfully replaced one dial-in conferencing number with another for selected users.


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