Collaboration Communications Systems Engineer — Question 101

You have a Microsoft Teams Phone deployment.

You have a PBX that connects to the PSTN by using an E1/T1 Primary Rate Interface (PRI).

You plan to migrate to Direct Routing by using the existing PSTN services.

What should you install upstream of the PBX?

Answer options

• A. a virtual Session Border Controller (SBC)
• B. an FXO SIP Analog Telephony Adapter (ATA)
• C. a physical Session Border Controller (SBC)
• D. a Session Border Controller (SBC) in Azure

Correct answer: C

Explanation

The correct answer is C, as a physical Session Border Controller (SBC) is necessary to facilitate the connection between the PBX and Teams for Direct Routing. Options A and D refer to virtual or cloud-based solutions, which are not suitable in this scenario. Option B is incorrect because an FXO SIP ATA is not designed for integrating with Teams for Direct Routing.