Ensure NTP and DNS are perfectly synced across the cluster before starting.
Even with careful planning, you may encounter issues. Here are some known considerations:
| Post-Installation Task | Purpose | | :--- | :--- | | Read Release Notes & Readmes | Understand all features and specific COP file requirements for your exact release. | | Reset Application User Passwords | Strengthen security post-installation. | | Install COP Files | Fix known defects and enable support for custom device types not initially included. | | Install a Dial Plan | If you are outside the North American Numbering Plan, download and install the appropriate locale-specific dial plan. | | Enable Mixed Mode | If you require security features (SRTP, encrypted signaling), install the CTL client and enable mixed mode for the cluster. | | Configure Trusted List of Hosts | Add any public IP addresses or DNS aliases to the Enterprise Parameters to ensure proper access. | | Perform Regular Backups | Set up automatic backups or schedule manual backups to protect your configuration and user data. | cisco cucm 125 download updated
: Transitioned to a centralized licensing model, requiring a Cisco Smart Account for management.
The feature simplifies adding devices. An administrator can create a phone record in CUCM without needing to know the device's MAC address beforehand, streamlining deployment. Ensure NTP and DNS are perfectly synced across
CUCM 12.5 is designed to run on VMware ESXi. Check the Cisco Collaboration Virtualization docs for specific OVA template requirements. 4. Upgrade Considerations
This means that as of this writing, version 12.5 is in its final stage of support. | | Reset Application User Passwords | Strengthen
Plan carefully, backup fully, verify compatibility, and follow a staged upgrade process. Testing and monitoring after each node update will minimize service disruption and reduce rollback risk.
While 12.5 is a mature release, recent SUs have delivered:
If you are on 12.5(1)SU2, you cannot directly upgrade to SU9. You may need intermediate SU releases or specific COP files. Check the of the SU9 upgrade ISO.