((install)): Cucm 15 Virtualization

Furthermore, while you can vMotion a CUCM 15 VM across hosts, you cannot easily move it across vCenter instances or to a public cloud (like AWS EC2) without re-architecting the network and storage latency. CUCM’s reliance on multicast for MOH (Music on Hold) and its intolerance for >10ms of WAN latency between publisher and subscriber nodes means that "hybrid cloud" is mostly marketing. Virtualization gives you portability within the data center, not across geographies.

Requirements remain largely consistent with version 14, generally requiring at least 2 vCPUs for standard deployments. Deployment Size Small (150–1,000 users) Medium (2,500–7,500 users) Large (10,000 users) (Specifications based on) 3. Upgrade and Migration Considerations cucm 15 virtualization