350-801 Question #124: Real Exam Question with Answer & Explanation

Question

When configuring Cisco Unified Communications Manager, which configuration enables phones to automatically register to a Cisco Unified Communications publisher when the connection to the subscriber is lost?

Options

• ACisco Unified CM Group
• BDevice Pool
• CSRST
• DRoute Group

Explanation

The Cisco Unified CM Group configuration, assigned to device pools, dictates the primary, secondary, and tertiary Cisco Unified Communications Manager servers that phones should attempt to register with, ensuring resilience in case of server connection loss.

Common mistakes.

• B. A Device Pool groups devices and applies common configurations like regions, locales, and Cisco Unified CM Groups, but the Device Pool itself does not define the failover sequence for registration; it merely assigns a CM Group.
• C. SRST (Survivable Remote Site Telephony) provides call processing redundancy for phones at remote sites when the WAN link to the central CUCM is lost, allowing them to register to a local gateway for basic call services, but it is not for registration failover between CUCM servers within the same cluster.
• D. A Route Group defines a prioritized list of gateways or trunks for outbound call routing, not for phone registration failover.

Concept tested. Cisco Unified CM Group for phone registration failover

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1_SU1/systemConfig/cucm_b_system-configuration-guide-1251su1/cucm_b_system-configuration-guide-1251su1_chapter_011.html

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