: CUCM 12.5 runs on CentOS, whereas previous versions used Red Hat Enterprise Linux.
| Filename Example | Purpose | |----------------|---------| | UCSInstall_UCOS_12.5.1.11900-8.sgn.iso | Signed ISO for fresh install | | cvac-12.5.1.11900-8.ova | vSphere OVA template with preconfigured resources | | ciscocm.cop.sha512 | Companion file for verification | Cisco Cucm 12.5 Download
For a fresh install, select the (e.g., UCSInstall_UCOS_12.5.1.11900-26.sgn.iso ). Be prepared for large file sizes (4GB to 6GB). : CUCM 12
Once downloaded, installing CUCM 12.5 is straightforward but requires planning. : CUCM 12.5 runs on CentOS
Before installing, verify the integrity of your download. Open a terminal (Linux/Mac) or PowerShell (Windows) and run: