Exam 300-820 topic 1 question 108 discussion

Actual exam question from Cisco's 300-820

Question #: 108
Topic #: 1

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?

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.
D. The default port for Mobile and Remote Access is 5091, which creates a conflict with the existing SIP trunks.

Show Suggested Answer

Suggested Answer: D 🗳️

by kasperl at March 21, 2023, 8:23 a.m.

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iamnoone

1 month, 3 weeks ago

Selected Answer: D

Looks like D is the correct answer, although "The default port for Mobile and Remote Access" is a little bit vague. For SIP signaling (OAuth) Expwc uses 5091 towards the CUCM. In which case it conflicts with the 591 used for the other SIP trunks.

upvoted 1 times

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Panda_man

6 months, 3 weeks ago

Selected Answer: D

The default ports are 5090 for on-premises and 5091 for MRA. To avoid port conflicts, ensure that these ports are not configured to listen any existing SIP Trunk in Unified CM. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-5/exwy_b_mra-expressway-deployment-guide/exwy_b_mra-expressway-deployment-guide_chapter_01000.html?bookSearch=true

upvoted 3 times

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isharif

11 months, 1 week ago

Selected Answer: D

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-5/exwy_b_mra-expressway-deployment-guide.pdf Step 1 On Unified CM node, do the following: a) Enable SIP OAuth Mode using the CLI command utils sip-oauth enable. b) Verify if SIP OAuth is set to listen on default ports (System > > Cisco Unified CM). The default ports are 5090 for on-premises and 5091 for MRA. To avoid port conflicts, ensure that these ports are not configured to listen any existing SIP Trunk in Unified CM.

upvoted 2 times

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Testme1235

1 year ago

Selected Answer: C

Option A is incorrect because Mobile and Remote Access does support OAuth with refresh. Option B is incorrect because the default port for Mobile and Remote Access is 6500, not 6001. Option D is incorrect because the default port for Mobile and Remote Access is 6500, not 5091.

upvoted 1 times

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kasperl

1 year, 1 month ago

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-5/exwy_b_mra-expressway-deployment-guide/exwy_b_mra-expressway-deployment-guide_chapter_01000.html?bookSearch=true

upvoted 1 times

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Exam 300-820 topic 1 question 108 discussion

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iamnoone

Panda_man

isharif

Testme1235

kasperl

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