Collaboration Communications Systems Engineer — Question 57

You have a Microsoft Teams Phone deployment.
You need to implement PSTN connectivity by using Direct Routing.
What are three requirements for the implementation? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.

Answer options

• A. a public DNS entry that maps the FQDN of the Session Border Controller (SBC) to a public IP address
• B. a Session Border Controller (SBC) that uses a hostname in the onmicrosoft.com domain
• C. a Teams-certified Session Border Controller (SBC)
• D. a firewall rule that opens a TCP signaling port to Microsoft Teams
• E. a firewall rule that opens a UDP signaling port to Microsoft Teams

Correct answer: A, C, D

Explanation

The correct answers are A, C, and D. A public DNS entry is necessary to ensure that the SBC can be reached by Teams, a Teams-certified SBC is required for compatibility and performance, and the firewall rule for TCP signaling is essential for establishing connections. Option B is incorrect because the SBC does not need to be in the onmicrosoft.com domain, and option E is wrong since the signaling port needed is TCP, not UDP.