Block Spam Calls in Microsoft Teams – Tenant Level

 Hello All

We are going to see , how to block the SPAM calls in Microsoft Teams Tenant Level

Even though spam call notification feature automatically evaluates incoming calls and identifies probable spam calls as “spam likely” in the calling policy, Users still have the option to answer or reject the call 

Whether it’s spam, telemarketing, or general nuisance, interruptions like this to your working day aren’t welcome. Whether it’s spam, telemarketing, or general nuisance, interruptions like this to our working day aren’t welcome.



One of the more hidden features in Microsoft Teams is the ability to block incoming calls from a number or a range of numbers at the organisation level. This isn’t something that’s visible or available in the Microsoft Teams Admin Center and requires the use of PowerShell.

So please use the below powershell commands to execute

 To find

 Ramki: 02/22/2023 07:13:36>Get-CsTenantBlockedCallingNumbers

  

Identity                     : Global

InboundBlockedNumberPatterns : {}

InboundExemptNumberPatterns  : {}

Enabled                      : True

Name                         : DefaultBlockedCallingNumbers

  

To add

 Ramki: 02/22/2023 07:14:31>New-CsInboundBlockedNumberPattern -Name "TestBlocknumber_01" -Enabled $True -Description "BlockTest" -Pattern "^\+?919003111180$"

  

Identity    : TestBlocknumber_01

Name        : TestBlocknumber_01

Enabled     : True

Description : BlockTest

Pattern     : ^\+?919003111180$

 

To Verify

 

Ramki: 02/22/2023 07:15:07>Get-CsTenantBlockedCallingNumbers

 

 Identity                     : Global

InboundBlockedNumberPatterns : {Name=TestBlocknumber_01;Enabled=True;Description=BlockTest;Pattern=^\+?919003111180$}

InboundExemptNumberPatterns  : {}

Enabled                      : True

Name                         : DefaultBlockedCallingNumbers

 

To Remove

 

Ramki: 02/22/2023 07:15:12>Remove-CsInboundBlockedNumberPattern -Identity "TestBlocknumber_01"

Ramki: 02/22/2023 09:06:43>Get-CsTenantBlockedCallingNumbers

 

 Identity                     : Global

InboundBlockedNumberPatterns : {}

InboundExemptNumberPatterns  : {}

Enabled                      : True

Name                         : DefaultBlockedCallingNumbers

 

Once active, rules simply cut the calls off at the other parties end immediately.

Depending on the carrier or network used by the person making the incoming call they will either be simply disconnected or they will get a message stating that their call cannot be completed. 

In my test, it rings first and got disconnected

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