Cisco Cucm Virtualization Requirements |top| Review

Cisco maintains a strict Compatibility Matrix. Deploying CUCM on an unsupported hypervisor version results in an "Unsupported Configuration," rendering TAC support limited or unavailable.

✅ Hardware listed on UCS compatibility matrix ✅ ESXi build exactly as per Cisco doc ✅ 1 vCPU per physical core – no overcommit ✅ Memory reservation = full VM memory ✅ Thick eager zeroed disks on low-latency storage ✅ NTP configured inside CUCM OS (not host sync) ✅ DRS set to partially automated or disabled for CUCM VMs cisco cucm virtualization requirements

CUCM in a VM is incredibly stable—if you follow the rules. Cisco’s requirements aren’t bloated; they exist because UC is real-time, intolerant of jitter, and demands deterministic resources. Cisco maintains a strict Compatibility Matrix

For CUCM 12.x and 14.x, the supported hypervisors are: Cisco’s requirements aren’t bloated

: Always check the Cisco Compatibility Matrix for your specific CUCM version. Generally, versions 6.7, 7.0, and 8.0 are supported for recent CUCM releases.