CCIE Collaboration: Understanding Device Pool and Destination Gateway in Cisco Unified CM Cluster

Device Pool and Destination Gateway Control

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A Call is made between two desk phones enabled with a single number each that are registered to a Cisco Unified CM cluster.

The device pool for each device has a local route group defined.

When the call is placed to exit the system, which device pool controls the destination gateway?



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A. B. C. D.


In a Cisco Unified Communications Manager (CUCM) cluster, device pools are used to group devices with similar characteristics such as location, calling privileges, and dial plan. Local route groups (LRGs) are used to provide a level of redundancy and load balancing for outbound calls.

When a call is made between two desk phones enabled with a single number each, and the devices are registered to a CUCM cluster, the destination gateway will be controlled by the device pool of the Source RDP (Remote Device Pool).

Here's why:

  1. The call flow starts at the source phone, which is associated with a device pool.
  2. The device pool of the source phone contains an LRG that is used to route the call.
  3. The LRG contains one or more gateway devices that are used to route the call outside the cluster.
  4. When the call reaches the destination gateway, it will use the LRG associated with the Source RDP to determine which gateway to use for the call.

Therefore, the correct answer is C. Source RDP.