The first phone in Tokyo lit up. Then twenty. Then two hundred. Registration requests flooded the virtual CUCM. She watched vCenter performance charts: CPU utilization spiked to 60%, then settled at 22%. Memory steady at 7.9GB. Network latency between nodes: 0.3ms.

She launched the Cisco-provided OVA template for CUCM 12.5. Four vCPUs. 8GB RAM. 110GB thick-provisioned eager-zeroed disk. The UCS blades hummed as the VM materialized on shared storage. No local disk failures. No proprietary hardware dependencies. Just pure, clean compute.

Mariana smiled. She had just saved the company $200,000 in hardware refresh costs and turned a weekend-long crisis into a quiet Tuesday night.