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Cisco 300-820 Exam - Topic 27 Question 111 Discussion

A company identifies a fraudulent toil situation. An engineer reviews the Cisco UCM call detail records and discovers that fraudulent calls originate from a Cisco Expressway-C server and are then routed to a 10-digit PSTN number. What must be configured to limit incoming Expressway calls to the internal Cisco UCM range of extensions 5XXXX?
C) unique search rule with a regex pattern of [5]\d{4}@abc.com that targets the neighbor zone
A) calling search space that contains all the partitions on the Unified Communications Manager SIP trunk to Expressway
B) call policy rule from the DNS zone to allow a destination regex pattern of \d.*@abc.com
D) call policy rule from the DNS zone to allow a destination regex pattern of .*@abc.com

Cisco 300-820 Exam - Topic 27 Question 111 Discussion

Actual exam question for Cisco's 300-820 exam
Question #: 111
Topic #: 27
[All 300-820 Questions]

A company identifies a fraudulent toil situation. An engineer reviews the Cisco UCM call detail records and discovers that fraudulent calls originate from a Cisco Expressway-C server and are then routed to a 10-digit PSTN number. What must be configured to limit incoming Expressway calls to the internal Cisco UCM range of extensions 5XXXX?

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Suggested Answer: C

by Theola at May 08, 2026, 03:54 AM

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Mica
3 days ago
I agree! I think option C is the best choice. It specifically targets the internal range.
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Art
8 days ago
This question is tricky. I feel like it’s testing our understanding of call routing.
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Ruth
13 days ago
But A might allow unwanted calls. C is safer.
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Lizette
19 days ago
I’m leaning towards A too. It covers all partitions.
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Barney
24 days ago
C is specific and effective. Regex helps narrow it down.
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Launa
29 days ago
A seems too broad. We need to limit calls specifically.
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Marg
1 month ago
I feel like C is the right choice. It targets the internal range directly.
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Georgeanna
1 month ago
This question is tricky. I think option A makes sense.
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Benedict
1 month ago
A is correct, but don't forget about the partitions!
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Sherman
2 months ago
I disagree, D seems too broad for this situation.
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Latanya
2 months ago
Wait, can we really limit calls like that? Sounds tricky.
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Ashanti
2 months ago
I think C is the way to go, regex is key here!
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Evan
2 months ago
Definitely A, you need that calling search space for proper routing.
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Clare
2 months ago
I’m leaning towards option A because it seems to align with limiting calls to specific extensions, but I wish I had more clarity on the other options.
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Mollie
4 months ago
I think the answer might be related to call policy rules, but I’m confused between options B and D. They both mention regex patterns, which makes it tricky.
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Carry
4 months ago
I feel like we practiced a similar question where regex patterns were involved. Option C sounds familiar, but I can't recall the exact details.
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Patrick
4 months ago
I remember we discussed something about calling search spaces in class. I think option A might be the right choice, but I'm not entirely sure.
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