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Disable-UMService

Use the Disable-UMService cmdlet to set the status of an Exchange Server 2010 Unified Messaging server to disabled. Exchange PowerShell reference

From the Exchange PowerShell reference 5 parameters Its page in the reference

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Parameters

5 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the Exchange 2010 UM server that you want to disable.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-ImmediateThe Immediate parameter specifies whether the UM server drops all current calls or enables current calls to finish.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.