MS-721 · Question #301
MS-721 Question #301: Real Exam Question with Answer & Explanation
The correct answer is D: The Digicert root certificate is missing on the SBC.. Direct Routing in Microsoft Teams uses TLS (Transport Layer Security) to encrypt the communication between Teams and the SBC. For TLS to function correctly, the SBC must have a valid certificate chain, and the root certificate authority must be trusted by Microsoft. If the Digice
Question
You have a Microsoft Teams Phone deployment. You are deploying Direct Routing by using a certified Session Border Controller (SBC). The FQDN of the SBC is sbc1.contoso.com. You use signaling port 5067. You cannot place calls and receive an error message in the Microsoft Teams admin center as shown in the following exhibit. What is a possible cause of the issue?
Options
- AThe failover timer is set to 0 seconds.
- BCalling plan licenses are not assigned to users.
- CThe Forward P-Asserted Identify (PAI) header is disabled.
- DThe Digicert root certificate is missing on the SBC.
Explanation
Direct Routing in Microsoft Teams uses TLS (Transport Layer Security) to encrypt the communication between Teams and the SBC. For TLS to function correctly, the SBC must have a valid certificate chain, and the root certificate authority must be trusted by Microsoft. If the Digicert root certificate (or any other required root certificate) is missing or not properly installed on the SBC, TLS connectivity cannot be established, resulting in an inactive TLS status. This would prevent the SBC from communicating with Microsoft Teams and handling calls.
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