: If you are setting up a lab or replacing a corrupted server, you need a bootable image to start the installation wizard on a blank virtual machine.

: Stands for "Unified Communications Operating System," the underlying Linux-based OS that runs Cisco's voice applications. : Short for "Unrestricted."

At the boot prompt, type:

The file name refers to the installer for Cisco Unified Communications Manager (CUCM) , specifically version 8.6(2). Users often seek "patched" or "bootable" versions of this software because Cisco typically provides only non-bootable upgrade images on their official download site. Core Technical Definitions Upgrading to CUCM 8.6.2 - Cisco Community