MS-721 Question #243: Real Exam Question with Answer & Explanation

Question

You have a Teams Phone deployment. You have a site named Site1 that contains a Session Border Controller (SBC) named SBC2. SBC2 uses Direct Routing and does NOT have local internet connectivity. Site1 has an MPLS connection to a datacenter that hosts another SBC named SBC1. SBC1 uses Direct Routing. You need to provide Enterprise Voice to the users in Site1 by configuring SBC2 to use SBC1. What should you configure?

Options

• ALocation-Based Routing
• Bproxy SBC
• CSIP options
• Dmedia bypass

Explanation

To provide Enterprise Voice to users in Site1 through SBC2, which lacks local internet connectivity and must route media through SBC1 in a datacenter, you need to configure Location-Based Routing. This ensures that media flows correctly according to network topology and PSTN connectivity restrictions.

Common mistakes.

• B. While an SBC can technically proxy SIP messages, "proxy SBC" is not the specific Teams Phone feature designed to handle media routing and regulatory requirements for sites without local internet connectivity in an LBR context.
• C. SIP options are used for SBC health monitoring and availability, not for dictating media path or call routing based on network location and internet connectivity.
• D. Media bypass is for optimizing media flow by sending it directly between the client and SBC, bypassing Microsoft 365. This scenario describes a requirement to not bypass a central SBC (SBC1) due to lack of local internet, making media bypass an inappropriate solution.

Concept tested. Direct Routing Location-Based Routing

Reference. https://learn.microsoft.com/en-us/microsoftteams/location-based-routing-plan

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