Question
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.
- A. a public DNS entry that maps the FQDN of the Session Border Controller (SBC) to a public IP address Correct
- B. a Session Border Controller (SBC) that uses a hostname in the onmicrosoft.com domain
- C. a Teams-certified Session Border Controller (SBC) Correct
- D. a firewall rule that opens a TCP signaling port to Microsoft Teams Correct
- E. a firewall rule that opens a UDP signaling port to Microsoft Teams
Explanation
Direct Routing requires a Microsoft-certified SBC, a public IP address with a public DNS entry for the SBC FQDN, and firewall rules for SIP signaling, which runs as SIP over TLS on TCP (port 5061 to the Microsoft SIP proxy). The SBC FQDN must be in a verified tenant domain; the default onmicrosoft.com domain is not supported. UDP is used for media, not for SIP signaling.
