Cisco Cucm Virtualization Requirements «2025-2027»

Let’s break down exactly what you need to know. Cisco publishes a Unified Communications Virtualization Compatibility Matrix (updated quarterly). If your hardware, hypervisor, or CPU isn’t listed there for your specific CUCM version— it is not supported.

Have a war story about a CUCM virtualization requirement you missed? Share it in the comments below. This post reflects best practices based on CUCM 12.x/14.x. Always check the latest Cisco documentation before deployment. cisco cucm virtualization requirements

Don’t be that engineer. ✅ Hardware listed on UCS compatibility matrix ✅ ESXi build exactly as per Cisco doc ✅ 1 vCPU per physical core – no overcommit ✅ Memory reservation = full VM memory ✅ Thick eager zeroed disks on low-latency storage ✅ NTP configured inside CUCM OS (not host sync) ✅ DRS set to partially automated or disabled for CUCM VMs Need to Check Your Current Environment? Run this from the CUCM CLI: Let’s break down exactly what you need to know

If you’ve ever deployed Cisco Unified Communications Manager (CUCM) in production, you already know: this is not a “throw it on any VMware cluster” situation. Have a war story about a CUCM virtualization

When in doubt:

Cisco maintains one of the most strict—and arguably most misunderstood—virtualization requirement documents in the industry. Ignoring it almost guarantees TAC will hang up on you (politely, but firmly).