A network engineer wants to delete unassigned phone extensions from the Cisco Unified Communications Manager system. Where is this task accomplished?

The Route Plan Report is the specific CUCM tool designed to list all directory numbers and patterns in the system, including those that are unassigned. From this report, an administrator can select and delete unassigned directory numbers directly, making it the correct location for this task.

The Directory Numbers configuration page is used to create or edit individual DNs, not to bulk-identify and remove unassigned ones.

Route Plan Details is not a distinct administrative feature in CUCM - the relevant tool is the Route Plan Report, not a details sub-page.

Enterprise Parameters control system-wide behavioral settings such as auto-registration and codec selection, and have no function for managing or deleting directory numbers.