Which option describes the recommended way to configure redundant Cisco Unified Communications Manager subscribers for Cisco IP phone registration in a single cluster for the Cisco Unified Contact Cen

Question

Options

• AAdd a redundant device pool to the Cisco Unified CallManager Group configuration.
• BAdd a second TFTP server to the cluster.
• CAdd an additional Cisco Unified Communications Manager subscriber to the Cisco Unified
• DUse an SRST reference in the device pool.

• A
  2% (1)
• B
  4% (2)
• C
  83% (39)
• D
  11% (5)

Explanation

Adding an additional CUCM subscriber to the Cisco Unified CallManager Group is correct because the CallManager Group defines the ordered list of CUCM nodes that IP phones attempt to register with - a second subscriber gives phones an automatic failover target within the same cluster if the primary node fails.

Why the distractors are wrong:

• A reverses the relationship - Device Pools reference CallManager Groups, not the other way around; you don't add device pools to a CallManager Group.
• B adding a second TFTP server improves configuration file delivery redundancy at boot time, but does nothing for call-processing or registration failover.
• D SRST (Survivable Remote Site Telephony) is a WAN-failure fallback for remote branch sites that lose connectivity to the cluster - it is not a redundancy mechanism within a single cluster.

Memory tip: Think of the CallManager Group as a "registration priority list" - to make registration redundant, you simply add more CUCM nodes to that list, in the order you want phones to try them.

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