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Microsoft MS-721 Exam - Topic 2 Question 47 Discussion

You have a Microsoft Teams Phone deployment.You are deploying Direct Routing.All users have a SIP URI in the format of user@contoso.com. 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?
B) The firewall blocks inbound traffic on port 443 to the SBC.
A) The certificate does not match the FQDN on the SBC.
C) Only TLS 1.0 is enabled on the SBC.
D) Microsoft 365 Phone System licenses are not assigned to the users.

Microsoft MS-721 Exam - Topic 2 Question 47 Discussion

Actual exam question for Microsoft's MS-721 exam
Question #: 47
Topic #: 2
[All MS-721 Questions]

You have a Microsoft Teams Phone deployment.

You are deploying Direct Routing.

All users have a SIP URI in the format of user@contoso.com. 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?

Show Suggested Answer Hide Answer
Suggested Answer: B

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

by Carlee at Aug 15, 2025, 12:48 AM

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Celestine
9 months ago
I agree, licenses should be assigned first before troubleshooting.
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Katy
9 months ago
Wait, are licenses really that crucial for this to work?
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Carmela
9 months ago
Sounds like a certificate issue to me.
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Leonard
10 months ago
Definitely check the TLS settings, could be outdated.
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Flo
10 months ago
I think it might be the firewall blocking traffic.
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Tasia
10 months ago
I feel like licensing could be a factor, but I thought that was more about user access than SBC errors. Option D might not be the right choice.
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Dahlia
10 months ago
I’m a bit confused about TLS versions; I know TLS 1.0 is outdated, but I’m not sure if that’s the main issue here.
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Werner
11 months ago
I think I saw a similar question where firewall settings were the issue, so option B could be a possibility too.
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Talia
11 months ago
I remember something about certificates needing to match the FQDN, so option A seems likely, but I'm not completely sure.
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Janine
11 months ago
Ah, I see. If the users don't have the right licenses, that could definitely cause issues with the Direct Routing setup. I'll make sure to verify that.
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Virgina
11 months ago
I think the key here is to methodically go through each option and eliminate the ones that don't seem to fit the problem description. That should help me narrow it down.
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Alecia
11 months ago
Wait, I'm a bit confused. Could it also be an issue with the firewall or TLS settings on the SBC? I'll need to double-check those as well.
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Milly
11 months ago
Okay, let's see here. The warning is about the certificate not matching the FQDN, so that's the first thing I'd check.
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Wai
12 months ago
Hmm, this looks like a tricky one. I'll need to carefully review the details and think through the possible causes.
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Raylene
12 months ago
I agree with Ashton, that seems like a likely reason for the issue.
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Ashton
1 year ago
I think the possible cause could be the firewall blocking outbound traffic on port 443 to Microsoft Teams.
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Harley
1 year ago
TLS 1.2 being enabled on the SBC? That's a wild guess, but hey, maybe the IT team is really into cyber security.
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Maurine
1 year ago
The firewall blocking traffic to the signaling port on the SBC seems like the most likely culprit here. I bet the network admin forgot to open that port.
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Julian
8 months ago
Sounds like a classic network issue!
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Rochell
8 months ago
Have you checked the firewall rules?
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Maybelle
9 months ago
Yeah, that’s a common oversight.
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Ben
9 months ago
I agree, the signaling port could definitely be blocked.
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