The required resources depend on the user capacity chosen during OVA deployment: Disk Space 80 GB (minimum) 2,500 Users 7,500 Users 2.50 GHz (each) 10,000 Users 2.50 GHz (each)
For the most current and specific information, always consult the official document: "Cisco Unified Communications Virtualization Requirements" (OL-28717-01) for CUCM 12.5(1). cisco cucm 12.5 virtualization requirements
