MS-720 Question #133: Real Exam Question with Answer & Explanation

Question

You have a Microsoft Teams Phone deployment that uses Direct Routing and two derived trunks named Trunk1 and Trunk2. Trunk1 experiences an outage. You need to ensure that Teams will route all calls by using Trunk2. What should you do?

Options

• AFrom PowerShell, run the Set-CsOnlinePSTNGateway cmdlet.
• BFrom the Microsoft Teams admin center, modify the Session Border Controller (SBC) objects.
• CFrom PowerShell, run the Set-CsOnlineVoiceRoute cmdlet
• DFrom Operator Connect in the Microsoft Teams admin center, modify the My operators settings.

Explanation

Running Set-CsOnlineVoiceRoute controls which PSTN gateway (trunk) a voice route uses, making it the correct tool to redirect calls from Trunk1 to Trunk2 - you update the route's OnlinePstnGatewayList to prioritize or exclusively list Trunk2. Option A (Set-CsOnlinePSTNGateway) configures properties of the SBC itself (like port, enabled status, or capacity), not which route uses it. Option B is a distractor because the Teams admin center SBC management doesn't offer the granular voice routing control needed here - routing logic lives in voice routes, not the SBC object. Option D is a dead end because Operator Connect is a separate carrier connectivity model; it doesn't manage Direct Routing trunks at all.

Memory tip: Think "Route → Route cmdlet." If you need to change where calls go, you modify the Voice Route (Set-CsOnlineVoiceRoute). If you need to change how an SBC behaves, you use Set-CsOnlinePSTNGateway. The distinction is destination vs. device.

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