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Exam MS-720 topic 3 question 12 discussion

Actual exam question from Microsoft's MS-720
Question #: 12
Topic #: 3
[All MS-720 Questions]

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 are 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?

  • A. Calling plan licenses are not assigned to users.
  • B. The Baltimore root certificate is missing on the SBC.
  • C. The SIP options are disabled.
  • D. The failover timer is set to 0 seconds.
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by Jedi at Oct. 9, 2022, 1:31 p.m.

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slaawek
2 years, 3 months ago
Selected Answer: B
Should be B in my view.
upvoted 3 times
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hadiwijaya
2 years, 3 months ago
Selected Answer: B
The installed root or intermediate certificate isn't part of the SBC certificate chain issuer. When the SBC starts the three-way handshake during the authentication process, the Teams service won't be able to validate the certificate chain on the SBC and will reset the connection. The SBC may be able to authenticate again as soon as the public Root certificate is loaded again on the service cache or the certificate chain is fixed on the SBC. Make sure that the intermediate and root certificate installed on the SBC are correct.
upvoted 2 times
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GPerez73
2 years, 5 months ago
Selected Answer: B
For me it is B https://learn.microsoft.com/en-us/microsoftteams/troubleshoot/phone-system/direct-routing/sip-options-tls-certificate-issues
upvoted 1 times
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BieLey
2 years, 5 months ago
Selected Answer: B
I say it's B: https://learn.microsoft.com/en-us/microsoftteams/troubleshoot/phone-system/direct-routing/sip-options-tls-certificate-issues#sip-options-issues
upvoted 1 times
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Vica12
2 years, 6 months ago
https://learn.microsoft.com/en-us/microsoftteams/troubleshoot/phone-system/direct-routing/sip-options-tls-certificate-issues The SBC is marked as inactive in the Microsoft Teams admin center. So I think C is correct.
upvoted 1 times
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wanapass
2 years, 6 months ago
B is the right answere, as TLS is inactive
upvoted 1 times
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Jedi
2 years, 6 months ago
C is not right. TLS would come up with or without SIP Options. I'm thinking B - pointing to a cert issue.
upvoted 2 times
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