An engineer has updated the company dial plan and wants to get rid of unassigned numbers. Which action must be taken in Cisco Unified Communications Manager to accomplish this task?

Route Groups are containers for gateways and trunks used in outbound call routing, and directory numbers are never managed or deleted from within a Route Group.

The Route Plan Report (Call Routing > Route Plan Report) lists all DNs, route patterns, and translation patterns across the system and can be filtered to show only unassigned DNs. From this report an engineer can select and delete those unassigned numbers, making it the correct and intended tool for this task.

Route Lists aggregate Route Groups for outbound path selection and have no association with directory numbers or unassigned DN management.

Route Patterns define digit strings that match and route outbound calls; unassigned directory numbers are not stored under or managed from Route Patterns.