Overview where a SBC is used

JFM_12​ - Could you please confirm if your issue resolved with above information or are you still looking for additional information?

@JFM_12 - Thanks for bringing this issue to our attention. 

Yes, you can use Microsoft Teams PowerShell to find where a Session Border Controller (SBC) is used in Voice Routing and other Direct Routing configurations.

Here are some useful PowerShell commands:

1. List all SBCs registered in Teams:
   

   Get-CsOnlinePSTNGateway

2. Find Voice Routes using a specific SBC:
   Replace <SBCFqdn> with your SBC’s FQDN.
   

   Get-CsOnlineVoiceRoute | Where-Object { $_.PstnGatewayList -contains "<SBCFqdn>" }

3. List all Voice Routes and their associated SBCs:
   

   Get-CsOnlineVoiceRoute | Select-Object Name, PstnGatewayList

4. Find Voice Routing Policies using a specific Voice Route:
   Replace <VoiceRouteName> with the route name found above.
   

   Get-CsOnlineVoiceRoutingPolicy | Where-Object { $_.OnlineVoiceRoutes -contains "<VoiceRouteName>" }

5. List all PSTN Usages and their associated Voice Routes:
   

   Get-CsOnlinePstnUsage

    

References: 
1. Get-CsOnlinePSTNGateway (MicrosoftTeams) | Microsoft Learn
2. Configure call routing for Direct Routing - Microsoft Teams | Microsoft Learn