300-820 · Question #125
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…
The correct answer is D. The default port for Mobile and Remote Access is 5091, which creates a conflict with the existing. MRA uses a dedicated SIP trunk between Expressway-C and Cisco UCM that defaults to port 5091. If the engineer has already configured a separate SIP trunk on port 5091 (for other inter-cluster traffic), there is a port conflict that prevents the MRA SIP trunk from functioning…
Question
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?
Options
- AMobile and Remote Access does not support OAuth with refresh with this configuration,
- BThe default port for Mobile and Remote Access is 6001. Therefore, the traversal port must be port
- CThe default port for Mobile and Remote Access is 6500, which creates a conflict with the existing
- DThe default port for Mobile and Remote Access is 5091, which creates a conflict with the existing
How the community answered
(52 responses)- A6% (3)
- B13% (7)
- C4% (2)
- D77% (40)
Explanation
MRA uses a dedicated SIP trunk between Expressway-C and Cisco UCM that defaults to port 5091. If the engineer has already configured a separate SIP trunk on port 5091 (for other inter-cluster traffic), there is a port conflict that prevents the MRA SIP trunk from functioning. The traversal zone port (6500) is separate from the SIP trunk port and is not the cause. The solution is to change the MRA SIP trunk to a non-conflicting port, or reassign the existing trunk on 5091.
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