: Note if you need the "Restricted" (standard) or "Unrestricted" (limited encryption for certain regions) version.
Go to login.cisco.com and create a free account. Without this, you cannot access the download portal. Cucm Download-
: Use Cisco DevNet to access live CUCM instances for testing and API development without needing to host the software yourself. : Note if you need the "Restricted" (standard)
Cisco Unified Communications Manager runs on the Cisco Unified Computing System (UCS). For labs, it runs on VMware Workstation or ESXi. Cucm Download-
Cisco regularly "End-of-Life" (EOL) older versions. If you need a CUCM download for version 10.5 or 11.5, you may find that the download button is grayed out or missing.