Cisco Cucm Virtualization - Requirements !link!

Cisco CUCM Virtualization Requirements: Architecture, Sizing, and Best Practices

While profiles change with software versions (e.g., CUCM 14.x vs 15.x), they generally follow a tiered structure: cisco cucm virtualization requirements

Run this from the CUCM CLI:

Resource allocation for CUCM is not dynamic; it is static and deterministic. Unlike data workloads that benefit from "thin provisioning" and memory sharing (ballooning/swap), CUCM requires dedicated resources. Cisco CUCM Virtualization Requirements: Architecture

When in doubt: