| Deployment Size | vCPU | RAM (GB) | Disk (GB) | Max Devices | |----------------|------|----------|-----------|--------------| | 1000 users | 2 | 8 | 110 | 1,000 | | 2500 users | 4 | 8 | 110 | 2,500 | | 7500 users | 6 | 12 | 110 | 7,500 | | 10k+ users | 8 | 16+ | 110+ | 10,000+ |

Start with the right OVA. Overprovision disk slightly. Reserve memory. Use fast storage. And for the love of dial tone, stay on the HCL.

Your future self (and your call quality) will thank you. Have a CUCM hardware horror story or a question about a specific server model? Drop a comment below—let’s help each other avoid downtime.

Cucm Hardware Requirements [upd] Here

| Deployment Size | vCPU | RAM (GB) | Disk (GB) | Max Devices | |----------------|------|----------|-----------|--------------| | 1000 users | 2 | 8 | 110 | 1,000 | | 2500 users | 4 | 8 | 110 | 2,500 | | 7500 users | 6 | 12 | 110 | 7,500 | | 10k+ users | 8 | 16+ | 110+ | 10,000+ |

Start with the right OVA. Overprovision disk slightly. Reserve memory. Use fast storage. And for the love of dial tone, stay on the HCL.

Your future self (and your call quality) will thank you. Have a CUCM hardware horror story or a question about a specific server model? Drop a comment below—let’s help each other avoid downtime.