Exam MS-721 topic 1 question 88 discussion

Actual exam question from Microsoft's MS-721

Question #: 88
Topic #: 1

You have a Microsoft Teams Phone deployment.

You are deploying Direct Routing.

All users have a SIP URI in the format of [email protected]. The Session Border Controller (SBC) is named sbc.voice.contoso.com.

When troubleshooting errors on the SBC, you receive the warning shown in the following exhibit.

What is a possible cause of the issue?

A. The tenant is missing a vanity domain ofvoice.contoso.com.
B. The firewall blocks inbound traffic on port 443 to the SBC.
C. Microsoft 365 Phone System licenses are not assigned to the users.
D. The certificate does not match the FQDN of the SBC.

Show Suggested Answer

Suggested Answer: D 🗳️

by Arkt at Nov. 4, 2023, 12:50 a.m.

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Jacobo12

1 year, 2 months ago

Selected Answer: D

D : Certificate issue

upvoted 1 times

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[Removed]

1 year, 5 months ago

Selected Answer: D

This is a cert issue.

upvoted 4 times

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Arkt

1 year, 6 months ago

Selected Answer: A

If TLS certificate has issues, it would show failed in TLS connectivity status. But in this case it does not receive SIP option which is most likely because of a missing vanity domain https://learn.microsoft.com/en-us/microsoftteams/troubleshoot/phone-system/direct-routing/sip-options-tls-certificate-issues#overview-of-the-sip-options-process

upvoted 1 times

[Removed]

1 year, 5 months ago

I am sorry, you are incorrect! A vanity domain or not, if there exists a mismatch in the domain name on the cert and the PBX you will have this issue.

upvoted 1 times

psp65

5 months ago

Seems that both a missing vanity domain and an issue with the TLS certificate can cause SIP OPTIONS requests to fail without a response...

upvoted 1 times

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Exam MS-721 topic 1 question 88 discussion

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Jacobo12

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Arkt

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psp65

SY0-701