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Cisco 300-820 Exam - Topic 25 Question 116 Discussion

An engineer configures a Cisco Collaboration environment to use Mobile and Remote Access for external access for company users. The engineer uses OAuth with refresh on the Cisco UCM SIP lines for extra security and improved user experience. During the setup, Mobile and Remote Access does not work, it is enabled on the Cisco UCM and Cisco Expressways. SIP trunks on ports 5090 and 5091 are configured to avoid conflicts with other SIP trunks between internal Cisco UCM clusters. The traversal zone also uses port 6500. The traversal zone between Expressways shows no errors, and the requests hit Expressway-E from the Internet. What is the reason that the solution does not work?
D) The default port for Mobile and Remote Access is 5091, which creates a conflict with the existing SIP trunks.
A) Mobile and Remote Access does not support OAuth with refresh with this configuration.
B) The default port for Mobile and Remote Access is 6001. Therefore, the traversal port must be port 6001 for Mobile and Remote Access to work.
C) The default port for Mobile and Remote Access is 6500, which creates a conflict with the existing traversal zone port.

Cisco 300-820 Exam - Topic 25 Question 116 Discussion

Actual exam question for Cisco's 300-820 exam
Question #: 116
Topic #: 25
[All 300-820 Questions]

An engineer configures a Cisco Collaboration environment to use Mobile and Remote Access for external access for company users. The engineer uses OAuth with refresh on the Cisco UCM SIP lines for extra security and improved user experience. During the setup, Mobile and Remote Access does not work, it is enabled on the Cisco UCM and Cisco Expressways. SIP trunks on ports 5090 and 5091 are configured to avoid conflicts with other SIP trunks between internal Cisco UCM clusters. The traversal zone also uses port 6500. The traversal zone between Expressways shows no errors, and the requests hit Expressway-E from the Internet. What is the reason that the solution does not work?

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Suggested Answer: D

by Leslee at Jul 19, 2026, 01:36 PM

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Maybelle
21 hours ago
I'm leaning towards B. The default port issue seems likely.
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Rory
6 days ago
I think it's option A. OAuth with refresh might not be compatible here.
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Boris
11 days ago
Really? I had no idea MRA had those port conflicts!
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Dalene
16 days ago
I'm leaning towards C. Conflicting ports can definitely cause problems.
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Adell
22 days ago
Wait, isn't the default port for MRA 6001? Sounds like B could be the issue.
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Lucille
27 days ago
Totally agree, A makes the most sense!
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Weldon
1 month ago
I think it's A. OAuth with refresh isn't supported here.
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Rozella
1 month ago
I vaguely remember something about SIP trunk ports needing to be unique, so maybe the conflict with port 5091 is the reason it’s not working?
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Melda
1 month ago
I feel like the traversal zone port being set to 6500 could be causing a conflict, but I need to double-check the default ports for Mobile and Remote Access.
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Dacia
2 months ago
I think I practiced a similar question where the default port for Mobile and Remote Access was mentioned, but I can't recall the exact details.
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Veronika
2 months ago
I remember reading that OAuth with refresh might not be fully supported in some configurations, but I'm not sure if that's the main issue here.
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