VoIP Manager requirements

Operating system
CPUs
Memory (RAM)
Disk space
Red Hat Enterprise Linux
2
4 GB
The memory and CPU requirements will change based on the size of the topology.
40 GB
CentOS/Photon OS
40 GB

VoIP Manager supported managed devices and software

Feature
Devices and Software
Cisco Unified Communications Manager (CUCM)
CUCM 11.0