Disclaimer: Cisco software is copyrighted. Downloading or using Cisco software without a valid license or service agreement constitutes software piracy and is illegal. Always obtain software through official Cisco channels.
For more information on Cisco CUCM 12.5, refer to the following resources: Cisco Cucm 12.5 Download
Compare the output string to the hash listed on Cisco's website. If they do not match, delete the file and restart the download. System Requirements and OVA Templates Disclaimer: Cisco software is copyrighted
Comprehensive Guide to Cisco CUCM 12.5: Features, Architecture, and Secure Download Procedures For more information on Cisco CUCM 12
Systems running versions or 12.0(x) can generally undergo a direct upgrade using the unified upgrade process. Because 12.5 changes the underlying operating system layers, the installer performs a "Refresh Upgrade," which reboots the server into a temporary installation environment to migrate data structures safely. Indirect Upgrade (Multi-step or PCD)