By following these steps, users can easily create a bootable installation media for CUCM 12.5 using the bootable ISO download feature.

Here is the "story" of how to actually get a bootable version working for your lab or installation. The "Legitimate" Path

CUCM 12.5 (Cisco Unified Communications Manager 12.5) is Cisco’s IP telephony call-processing software for enterprise voice, video, messaging, and mobility services. A “bootable ISO” for CUCM is an image you can burn to DVD or mount to virtual machines to install or upgrade CUCM on supported hardware or virtual platforms.