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Exam MS-720 topic 3 question 8 discussion

Actual exam question from Microsoft's MS-720
Question #: 8
Topic #: 3
[All MS-720 Questions]

You have a Microsoft Teams Phone deployment.
You need to implement PSTN connectivity by using Direct Routing.
What are three requirements for the implementation? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.

  • A. a Session Border Controller (SBC) that uses a hostname in the onmicrosoft.com domain
  • B. a firewall rule that opens a TCP signaling port to Microsoft Teams
  • C. a public DNS entry that maps the FQDN of the Session Border Controller (SBC) to a public IP address
  • D. a firewall rule that opens a UDP signaling port to Microsoft Teams
  • E. a Teams-certified Session Border Controller (SBC)
Show Suggested Answer Hide Answer
Suggested Answer: BCE 🗳️
Reference:
https://docs.microsoft.com/en-us/microsoftteams/direct-routing-plan
by IgorMatic at Dec. 19, 2021, 1:33 p.m.

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Only_Me1
Highly Voted 3 years, 4 months ago
Answer is correct as the question says UDP *SIGNALLING* port - signalling in Teams is over TCP so opening the UDP ports for signalling answer is invalid here - had it been UDP media ports then there would have been an issue.
upvoted 8 times
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fejoes
Most Recent 3 years, 3 months ago
Signaling port TCP is correct. MS Teams uses 5067 TLS for signaling which is TCP based.
upvoted 4 times
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covid_9
3 years, 4 months ago
Agreed answers are correct TCP is signaling UDP is Media
upvoted 4 times
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charles11
3 years, 4 months ago
anyone who passes this exam, may i know the 55q can pass the exam? I just faild twice for ms-720 exam,just.....wuhawu
upvoted 1 times
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IgorMatic
3 years, 4 months ago
i think the answer should be: C - D - E it is recommended to open UDP Ports 3478,3479,3480,3481 from Teams Client to TR/MP which are in the Microsoft Global Network, if the UDP is blocked by firewall the TCP will be used.
upvoted 3 times
uiui
3 years, 4 months ago
Signaling to Teams is TCP 5061. UDP is mediastream and not signaling.
upvoted 7 times
IgorMatic
3 years, 4 months ago
yes, you are right.
upvoted 3 times
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