Collaboration Communications Systems Engineer — Question 63

You have a Microsoft Teams deployment and an existing telephony solution that provides PSTN capability to on-premises third-party PBX systems in two separate locations.

You need to implement a redundant PSTN solution for Microsoft Teams Phone. The solution must use the existing telephony carrier services. The solution must ensure that outbound calls can be made if a component fails.

Which three components should you implement? Each correct answer presents part of the solution.

NOTE: Each correct selection is worth one point.

Answer options

• A. calling policies
• B. PSTN usages
• C. tenant dial plans
• D. voice routing policies
• E. highly available Session Border Controllers (SBCs)

Correct answer: B, D, E

Explanation

The correct components for a redundant PSTN solution are PSTN usages (B), voice routing policies (D), and highly available Session Border Controllers (SBCs) (E). PSTN usages define how calls route to and from the PSTN, voice routing policies control how calls are directed based on the dialed number, and SBCs ensure high availability. Calling policies (A) and tenant dial plans (C) are important but do not directly address the redundancy requirement for outbound calls.