350-801 Question #493: Real Exam Question with Answer & Explanation

Question

An engineer configures Cisco UCM to use a second PSTN provider and ensures that the called party information that is sent matches what the provider expects. However, the engineer already configured the gateway, created the route group, and added the route group to the existing route list. Which action ensures the called party information requirement without affecting the existing PSTN provider?

Options

• AAdd a called party transform mask to the route list detail for the new PSTN route group.
• BAdd a called party transform mask to the route pattern.
• CAdd an external phone number mask to all devices.
• DAdd a calling party transform mask to the route pattern.

Explanation

To correctly format called party information for a new PSTN provider without affecting existing configurations, a called party transform mask should be applied at the route list detail level.

Common mistakes.

• B. Adding a called party transform mask to the route pattern would affect all route groups associated with that pattern, including the existing PSTN provider, which is not desired.
• C. An external phone number mask is primarily for displaying numbers on IP phones and does not transform the actual called party number sent to a PSTN provider.
• D. A calling party transform mask modifies the calling number, not the called number, and placing it on the route pattern would affect all associated route groups.

Concept tested. Cisco UCM route list detail called party transformation

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1SU1/systemConfig/cucm_b_system-configuration-guide-1251su1/cucm_b_system-configuration-guide-1251su1_chapter_01000.html#task_4083F8E0AE18898F845C227F70F88D97

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