Virtualization for Cisco Unified Communications Manager (CUCM)

Publisher

Cisco Systems

URL

https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/uc_system/virtualization/virtualization-cisco-unified-communications-manager.html

Published

unknown

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

Cisco website terms of use; no-redistribution; short excerpts and locators only

Source notes citing this source

• Because Version 14/15 Small is the only size allowing a 2.00 GHz base frequency, and Cisco only guarantees 2.00 to 2.49 GHz CPUs for small systems (under 1,000 users and 2,500 devices), Small most likely corresponds to that small-system envelope. inferred in context
• For Unified CM 12.5(1) SU2 and later, the virtualization page lists VMware vSphere ESXi 6.5, 6.7 and 7.0 U1. in context
• For 12.5(1) SU2 and later, Unified CM VM configurations are named by user count (150, 1,000, 2,500, 7,500 and 10,000 users). The 10,000-user configuration is 4 vCPU at 2.50 GHz, 8 GB vRAM and one 110 GB vDisk. in context
• Cisco's Unified CM virtualization page lists VMware vSphere ESXi 6.7, 7.0 U1 and 8.0 U1 as supported for Unified CM Version 14. in context
• The Version 14 Large recommended starting point is 4 vCPU at 2.50+ GHz, 8 GB vRAM and one 110 GB vDisk. The Medium starting point is 2 vCPU at 2.50+ GHz, 8 GB and 110 GB. in context
• For Unified CM Version 14, a cluster node needs at least 2 vCPU, a 2.00 GHz physical CPU base frequency, 6 GB vRAM and one 80 GB vDisk. in context
• For Versions 14 and 15, the Unified CM virtualization page presents Small, Medium and Large as recommended starting points without user or device counts, and points to the Collaboration Sizing Tool (CST) for prescriptive VM specifications. in context
• Cisco's Unified CM virtualization page lists VMware vSphere ESXi 7.0 U3 and 8.0 U1 as supported for Unified CM Version 15. in context
• The Version 15 Large recommended starting point is 4 vCPU at 2.50+ GHz, 14 GB vRAM, one 110 GB vDisk and one 1GbE+ vNIC. in context
• The Version 15 Medium recommended starting point is 2 vCPU at 2.50+ GHz, 12 GB vRAM, one 110 GB vDisk and one 1GbE+ vNIC. in context
• For Unified CM Version 15, a cluster node needs at least 2 vCPU, a physical CPU base frequency of at least 2.00 GHz, 10 GB vRAM, one 110 GB vDisk and 1 vNIC. in context
• The Version 15 Small recommended starting point is 2 vCPU at 2.00+ GHz, 10 GB vRAM, one 110 GB vDisk and one 1GbE+ vNIC. in context

Cite this source record

APA

WarmTransfer. (2026, September 25). Virtualization for Cisco Unified Communications Manager (CUCM). WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-virt-cucm-page

BibTeX

@misc{warmtransfer-cisco-virt-cucm-page,
  title  = {Virtualization for Cisco Unified Communications Manager (CUCM)},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-virt-cucm-page},
  note   = {Cisco Systems, accessed 2026-09-25}
}