Hotspot Question You have a Microsoft Teams Phone deployment. Direct Routing is enabled for all users. The users can place and receive PSTN calls. You are implementing emergency numbers in Teams. You

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This question tests knowledge of Microsoft Teams Direct Routing emergency call routing policy configuration using PowerShell, specifically how to assign SBCs (Session Border Controllers) to voice routes that strip the '+' prefix from three-digit emergency numbers before forwarding to the SBC.

Approach. When configuring emergency calling in Teams Direct Routing, you create multiple CsOnlineVoiceRoute objects (or an emergency call routing policy) and assign each route a specific OnlinePstnGatewayList. The three targets in the script represent three separate route definitions: the first route is assigned only 'sbc1.contoso.com' (primary gateway), the second route uses 'sbc2.contoso.com' and 'sbc3.contoso.com' (a secondary/failover pair), and the third route uses 'sbc1.contoso.com' and 'sbc3.contoso.com' (another pairing for redundancy or a different emergency PSTN usage). This layered SBC assignment pattern ensures emergency calls have multiple failover paths. The number pattern in each route (e.g., ^\+(\d{3})$) combined with a translation rule effectively strips the leading '+' before the call reaches the SBC, which is required because many SBCs do not accept E.164-formatted three-digit numbers.

Concept tested. Microsoft Teams Direct Routing - configuring New-CsOnlineVoiceRoute (or New-CsTeamsEmergencyCallRoutingPolicy) with the -OnlinePstnGatewayList parameter to assign SBCs per route, enabling + symbol stripping for short-code (three-digit) emergency number routing.

Reference. Microsoft Learn: Configure emergency calling for Direct Routing - https://learn.microsoft.com/en-us/microsoftteams/direct-routing-configure-emergency-calling

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