In the Cisco Unified Contact Center Enterprise solution, if the Cisco Unified Communications Manager subscriber for the Cisco voice gateway is down, how will incoming calls be treated?

Question

Options

• AThe call will get a "fast busy" and be terminated by the gateway.
• BThe voice gateway will reroute the call to a secondary CTI route point.
• CThe voice gateway will use the alternative/backup subscriber in the cluster for call control.
• DThe voice gateway will route around the subscriber to an IP IVR port.

• A
  7% (4)
• B
  3% (2)
• C
  75% (45)
• D
  15% (9)

Explanation

Option C is correct because Cisco Unified Communications Manager (CUCM) operates in a cluster architecture, and voice gateways are configured with both a primary and an alternative/backup subscriber for exactly this scenario - if the primary subscriber goes down, the gateway automatically fails over to the backup subscriber to maintain call control without dropping the call.

Why the distractors are wrong:

• A is wrong because a "fast busy" treatment would represent a complete failure with no failover - CUCM clusters are specifically designed to prevent this.
• B is wrong because CTI route points are logical objects within CUCM; the gateway cannot independently reroute to them if the subscriber handling call control is unreachable.
• D is wrong because IP IVR ports also depend on CUCM for registration and call routing - the gateway cannot bypass the subscriber to reach them directly.

Memory tip: Think of CUCM subscribers like a primary/backup pair on a network switch - the voice gateway always has a "Plan B" subscriber registered, so calls keep flowing even when the primary goes dark. The keyword is cluster redundancy.

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