Cucm 15 Virtualization |best|

CUCM 15’s virtualization-only strategy is not a feature; it is a reckoning. It forces the voice engineering team to merge with the virtualization and cloud teams, breaking down silos that have existed since the Avaya Definity era. The essay’s final judgment is this: CUCM 15 sacrifices the simplicity of the appliance for the agility of the virtual machine. It demands a higher level of vSphere competence—CPU reservations, PVSCSI tuning, anti-affinity rules, and distributed switch configuration—but rewards that effort with hardware independence, faster recovery, and the ability to treat call control as code.