CmdID

CmdID / PowerShell / Cmdlets / Get

Get-CsOnlinePstnUsage

Returns information about online public switched telephone network (PSTN) usage records used in your tenant. Microsoft Teams PowerShell reference

From the Microsoft Teams PowerShell reference 2 parameters Its page in the reference

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Parameters

2 in the Microsoft Teams PowerShell reference
-FilterThe Filter parameter allows you to retrieve only those PSTN usages with an Identity matching a particular wildcard string.
-IdentityThe level at which these settings are applied.