The images available here are generally non-bootable upgrade files. They are intended for upgrading existing systems through the OS Administration interface.
Cisco provides software through its official Software Central portal. Access depends on your current licensing and contract status. 1. Standard Downloads (ISO and OVA) Cisco Cucm 12.5 Download
These templates define the virtual hardware requirements (CPU, RAM, Disk) for your VM and are essential for a stable deployment. 2. Obtaining Bootable Media The images available here are generally non-bootable upgrade
Cisco Unified Communications Manager (CUCM) 12.5 Download and Implementation Guide Cisco Cucm 12.5 Download