Requirements | Cucm Hardware

The Central Processing Unit (CPU) and Random Access Memory (RAM) requirements are dictated by the "load" the CUCM must handle. This load is calculated not just by the number of phones, but by the number of "Busy Hour Call Attempts" (BHCA). A system with 10,000 idle phones has a vastly different hardware requirement than a system with 1,000 phones making constant calls.

These are pre-tested server configurations (like the UCS C220 or C240 series). Cisco provides specific documentation on exactly how many CUCM instances can fit on one TRC. This is the "safe" route for most engineers. Specs-Based Hardware cucm hardware requirements

Here’s what you actually need to know. The Central Processing Unit (CPU) and Random Access

Cisco officially supports CUCM on:

Even with the right OVA, poor host configuration kills performance. These are pre-tested server configurations (like the UCS