CmdID

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Get-UMCallAnsweringRule

Use the Get-UMCallAnsweringRule cmdlet to view the properties of a Unified Messaging (UM) call answering rule that is created within a UM-enabled mailbox. Exchange PowerShell reference

From the Exchange PowerShell reference 3 parameters Its page in the reference

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Parameters

3 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the identifier for a call answering rule being viewed.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-MailboxThe Mailbox parameter specifies the UM-enabled mailbox that contains the UM call answering rule.