The deployment starts within your virtualization environment (typically VMware ESXi):
You must deploy the Cisco-provided OVA template to create the virtual machine. This template pre-configures the CPU, RAM, and disk allocations based on your user count. Cisco Cucm 12.5 Download
Once you have downloaded CUCM 12.5, follow these steps to install and configure the solution: Cisco Cucm 12.5 Download
What is the total and endpoints for this system? Cisco Cucm 12.5 Download