CmdID / PowerShell / Cmdlets / Get
Get-CsTeamsUnassignedNumberTreatment
Displays a specific or all treatments for how calls to an unassigned number range should be routed. Microsoft Teams PowerShell reference
From the Microsoft Teams PowerShell reference 3 parameters Its page in the reference
Parameters
-FilterEnables you to limit the returned data by filtering on the Identity attribute.-IdentityThe Id of the specific treatment to show.-MsftInternalProcessingMode