Discover the correct PowerShell cmdlet to ensure Teams users maintain PSTN call continuity during internet outages using Survivable Branch Appliances (SBA) in Microsoft Teams deployments.
Table of Contents
Question
You have a Microsoft Teams Phone deployment that has an office in Seattle. The Seattle office contains a Survivable Branch Appliance (SBA).
In the Seattle office, you add a new Teams user named User1.
You need to ensure that User1 can make and receive PSTN calls during an internet outage.
Which PowerShell cmdlet you should run?
Select only one answer.
A. Grant-CsTeamsSurvivableBranchAppliancePolicy
B. New-CsOnlinePSTNGateway
C. New-CsOnlineVoiceRoutingPolicy
D. New-CsTeamsSurvivableBranchAppliancePolicy
Answer
To ensure User1 in the Seattle office can make and receive PSTN calls during an internet outage using the Survivable Branch Appliance (SBA), you must run the Grant-CsTeamsSurvivableBranchAppliancePolicy cmdlet.
A. Grant-CsTeamsSurvivableBranchAppliancePolicy
Explanation
To assign the policy to individual users, you use the Grant-CsTeamsSurvivableBranchAppliancePolicy cmdlet.
During an internet outage, the Teams client must switch to the SBA automatically, and ongoing calls should continue with no interruptions. No action is required by the user. As soon as the Teams client detects that the internet is up and any outgoing calls are finished, the client will fall back to normal operation mode and connect to other Teams services. The SBA will upload collected call data records to the cloud and the call history will be updated so that this information is available for review by a tenant administrator. When the Teams client is in offline mode, the following calling-related functionality is available:
- Making PSTN calls via the local SBA/SBC with media flowing through the Session Border Controller (SBC)
- Receiving PSTN calls via the local SBA/SBC with media flowing through the SBC
- Hold and resume of PSTN calls
The SBA provides PSTN call continuity during internet outages by routing calls through a local Session Border Controller (SBC). For users to leverage this functionality, they must be assigned a Teams branch survivability policy that links them to the SBA.
Option A (Correct):
Grant-CsTeamsSurvivableBranchAppliancePolicy assigns the survivability policy to User1, enabling connectivity to the SBA during outages. This ensures the Teams client automatically fails over to the SBA when internet connectivity is lost.
Option B:
New-CsOnlinePSTNGateway configures a PSTN gateway for Direct Routing but does not assign survivability policies.
Option C:
New-CsOnlineVoiceRoutingPolicy defines call routing rules but does not enable SBA functionality.
Option D:
New-CsTeamsSurvivableBranchAppliancePolicy creates a new survivability policy but does not assign it to users. After creating a policy, you must use Grant-CsTeamsSurvivableBranchAppliancePolicy to apply it.
Critical Requirements
- The SBA must already be configured with New-CsTeamsSurvivableBranchAppliance.
- User1 must be assigned the policy via Grant-CsTeamsSurvivableBranchAppliancePolicy to activate SBA failover.
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