The ISO creates an initial root password and an administrator (application user). The default is often admin / newroot (change immediately). If you lose these, you cannot complete the installation.
Cisco publishes MD5/SHA512 checksums. :
For customers who have already purchased the software but need to re-download the installation media. cucm 12.5 bootable iso download
Before downloading the ISO, ensure your system meets the minimum requirements for CUCM 12.5: The ISO creates an initial root password and
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