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Understanding how outbound dialing is structured in CUCM helps see why this relationship fits. A route group is an ordered collection of gateways or trunks; it defines the set of paths that can be tried for a given destination. A route list is an ordered collection of route groups and is what you reference in a route pattern to determine the overall path a call should take. When a call is routed, CUCM picks the first route group in the route list and tries its gateways in order, moving to the next gateway if one is busy or unavailable. If all gateways in that group fail, it proceeds to the next route group in the list and repeats. This setup provides redundancy and control over which paths are preferred and how failures move to backup options. The other statements don’t fit because a route list isn’t a list of gateways itself, and route groups aren’t about CTI routing or translation patterns in themselves; their purpose is to group gateways and then be referenced by a route list to define the call path.