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Microsoft MS-721 Exam - Topic 1 Question 57 Discussion

You have a Microsoft Teams Phone deployment.You are deploying Direct Routing by using a certified Session Border Controller (SBC). The FQDN of the S6C is sbcVcontoso.com. You use signaling port 5067.You cannot place calls and receive an error message m the Microsoft Teams admin center as shown in the following exhibit.What is a possible cause of the issue?
C) The Forward P-Asserted Identify (PA!) header is disabled.
A) Location-Based Routing is enabled for the SBC
B) The Baltimore root certificate is missing on the SBC.
D) The failover timer is set to 0 seconds

Microsoft MS-721 Exam - Topic 1 Question 57 Discussion

Actual exam question for Microsoft's MS-721 exam
Question #: 57
Topic #: 1
[All MS-721 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 S6C is sbcVcontoso.com. You use signaling port 5067.

You cannot place calls and receive an error message m the Microsoft Teams admin center as shown in the following exhibit.

What is a possible cause of the issue?

Show Suggested Answer Hide Answer
Suggested Answer: C

by Jolene at May 13, 2026, 11:06 AM

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Bethanie
4 days ago
I feel like option D is less likely. A failover timer of 0 seconds is unusual.
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Sena
9 days ago
Option C seems likely as well. Disabling the P-Asserted Identity header can lead to problems.
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Aimee
14 days ago
I agree, but what about option A? Location-Based Routing could block calls too.
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Olga
19 days ago
I think option B is the issue. Missing certificates can cause call failures.
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Carmen
25 days ago
Definitely B) - I've seen that happen before!
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Keneth
30 days ago
D) The failover timer set to 0 seconds sounds like a big problem.
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Lettie
1 month ago
Wait, could it really be C)? That seems odd.
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Galen
1 month ago
I think it's A) Location-Based Routing causing the issue.
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Rex
2 months ago
B) The Baltimore root certificate is missing on the SBC.
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Leila
2 months ago
D) The failover timer being set to 0 seconds sounds risky!
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Melda
2 months ago
A) Location-Based Routing could also be a factor here.
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Ciara
2 months ago
Wait, could it really be just the certificate? Seems too simple.
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Roxane
2 months ago
Totally agree, that seems like a common issue.
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Christiane
2 months ago
B) The Baltimore root certificate is missing on the SBC.
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Billye
3 months ago
I feel like the failover timer being set to 0 seconds could definitely cause problems, but I need to double-check that detail.
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Brock
3 months ago
The P-Asserted Identity header sounds familiar, but I can't remember if disabling it would cause this exact issue.
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Youlanda
3 months ago
I think the Baltimore root certificate is crucial for the SBC to function properly, but I can't recall if it was specifically mentioned in our practice questions.
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Shaniqua
4 months ago
I remember studying about Location-Based Routing, but I'm not sure if it would prevent calls from being placed.
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