Câu 64: MS-721: Collaboration Communications Systems Engineer

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?

1. A. Calling plan licenses are not assigned to users
2. B. The failover timer is set to 0 seconds
3. C. The Forward P-Asserted Identify (PAI) header is disabled
4. D. The Baltimore or the Digicert root certificates are missing on the SBC. — đáp án hiện tại