Used exclusively through the OS Administration portal or Prime Collaboration Deployment (PCD) to upgrade an existing, functional cluster. Cisco Options Package (COP) Files
You must first upgrade to 12.5(1) base, then apply SU and COP files. Several upgrade COP files are required. Follow Cisco’s upgrade guide.
Accessing Cisco software requires a valid service contract. The primary download portal is the . The official Cisco website is the only authorized source for CUCM software. cisco cucm 125 download updated
– Search for: "Cisco Unified Communications Manager System Configuration Guide 12.5"
Generate a registration token from your corporate . Used exclusively through the OS Administration portal or
Select or DVD/CD (if mounting an ISO via vSphere).
After downloading the updated ISO, English works fine, but if you need French, German, or Japanese prompts, download the corresponding from the same portal. Follow Cisco’s upgrade guide
A valid Cisco Connection Online (CCO) user account.
Cisco provides OVA templates that pre-configure the VM with the required compute resources for different deployment scales. To perform a fresh installation, you import the appropriate OVA file for your expected user count. Using a generic VM configuration is not supported. The OVA file defines the number of virtual CPUs, RAM, and disk size for each deployment type.