Exam MS-720 topic 6 question 6 discussion

Actual exam question from Microsoft's MS-720

Question #: 6
Topic #: 6

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 certificate does not match the FQDN on the SBC.
B. The firewall blocks inbound traffic on port 443 to the SBC.
C. Only TLS 1.0 is enabled on the SBC.
D. Microsoft 365 Phone System licenses are not assigned to the users.

Show Suggested Answer

Suggested Answer: A 🗳️
Reference:
https://docs.microsoft.com/en-us/microsoftteams/troubleshoot/phone-system/direct-routing/sip-options-tls-certificate-issues

by Sanko at Feb. 2, 2022, 8:25 a.m.

Comments

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sylee

Highly Voted 3 years, 4 months ago

Just passed the exam today. This question was included and Microsoft updated the the answer C to TLS 1.2....Thus leaving A to be the only correct answer.

upvoted 8 times

PrettyFlyWifi

3 years, 3 months ago

C has been updated to TLS 1.2 and it has also updated answer A to something like " vanity domain of voice.contoso.com has been added. "

upvoted 1 times

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tester18128075

Most Recent 3 years, 1 month ago

A is correct

upvoted 1 times

nagass

3 years, 1 month ago

Did you take the exam recently? how many questions from this set please?

upvoted 1 times

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Lukas2100

3 years, 4 months ago

answers has been updated. New Answer should be: Firewall blocks Signaling Port

upvoted 2 times

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Lukas2100

3 years, 4 months ago

A is correct. B and D doesnt make any sense. In my testlab with an audiocodes ve sbc tls 1.2 is preconfigured for teams in the sbc wizard. So you only need to add the correct certificate to the Teams tls context with CN = Device Name

upvoted 2 times

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Sanko

3 years, 4 months ago

should not be C? If the TLS connection is closed right away and SIP options are not received from the SBC, or if 200 OK is not received from the SBC, then the problem might be with the TLS version. The TLS version configured on the SBC should be 1.2 or higher.

upvoted 1 times

Lukas2100

3 years, 4 months ago

On an audiocodes sbc there is Tls 1.2 preselected if you are running the sbc Wizard.

upvoted 2 times

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