These images contain a boot sector (using isolinux.bin ) that allows a virtual machine to start the installation wizard from the virtual DVD drive. How to Create a Bootable ISO
The file is a critical software image used for recovering, upgrading, or performing a "bare-metal" installation of Cisco Unified Communications (UC) applications. Specifically, this version is associated with Cisco Unified Communications Manager (CUCM) or Unity Connection deployments. What is this file? The filename follows Cisco's standard naming convention: bootable ucsinstall ucos unrst 8621000014sgn161
A VMware ESXi host with the correct OVA template for CUCM 8.6. These images contain a boot sector (using isolinux