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Exam 350-801 topic 1 question 71 discussion

Actual exam question from Cisco's 350-801
Question #: 71
Topic #: 1
[All 350-801 Questions]

Refer to the exhibit.

Cisco Unified Border Element is attempting to establish a call with Subscriber 1, but the call fails. Cisco Unified Border Element then retries the same call with
Subscriber 2, and the call proceeds normally. Which action resolves the issue?

  • A. Verify that the Run On All Active Unified CM Nodes checkbox is enabled.
  • B. Verify that the correct calling search space is selected for the Inbound Calls section.
  • C. Verify that the Significant Digits field for Inbound Calls is set to All.
  • D. Verify that the PSTN Access checkbox is enabled.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by Slushed at May 1, 2022, 11:16 p.m.

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Slushed
Highly Voted 2 years, 6 months ago
The correct answer is A. Run On All Unified CM Nodes allows Subscribers NOT configured within the Call Manager Group that is applied to Route Lists and/or SIP Trunks to process calls. There is a whole rabbit whole with how this feature works when only applied to one or the other but per best practice, unless there is a VERY specific reason, you want this check box enabled on ALL Route Lists and SIP Trunks.
upvoted 11 times
G0y0
2 years, 5 months ago
I agree, it is A. 503 could be a symptom of overload or congestion in subscriber 1 due to bad call load balancing. Therefore, Run On All Unified CM Nodes allows a better call load balancing to avoid overloading over one server, and then a better call distribution.
upvoted 5 times
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Obama42
Highly Voted 2 years, 3 months ago
Selected Answer: A
there is no reason to be inbound CSS, the sub2 get answered.Then the correct answer is A.
upvoted 5 times
skneff
10 months ago
I was torn between A and B, but A makes sense for that exact reason. If both servers are in the same cluster, their CSS configuration would be the same, thus no reason to believe B would be the solution. There could be other reasons that you get a 503 Service unavailable, but A is the only possible reason listed.
upvoted 1 times
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G0y0
Most Recent 2 months ago
Selected Answer: A
Commonly when there is a issue about Call Privileges, you get a reject or a 404 code. Meanwhile 5XX is a problem of the servers cause it can not provide temporally the service the client is looking for. So it could be that the call manager service is no running in that server, or could be that in that subscriber is not running an instance of that sip trunk, or any other issue with the application, so it can bot be B. or C. Meanwhile C. is a nonsense.
upvoted 1 times
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DaKenjee
1 year, 11 months ago
Selected Answer: A
503 - Service Unavailable - The server's SIP service is temporarily unavailable. If CSS is missing it would not find a proper DN, and will return <404 - not found< Since there is no answer of several Trunks, it only explains one trunk and >Run On All Unified CM Nodes< should put in concern
upvoted 3 times
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Piji
2 years, 3 months ago
Selected Answer: A
Correct answer is A.
upvoted 3 times
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C (25%)
B (20%)
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