Introduction to ciscocm-ucm-resetudi.k3.cop.sgn Software
The ciscocm-ucm-resetudi.k3.cop.sgn is a critical security utility package designed for Cisco Unified Communications Manager (CUCM) systems to manage cryptographic keys and resolve certificate validation errors during software upgrades. This COP (Cisco Options Package) file ensures compliance with Cisco’s enhanced security framework by regenerating or resetting User Device Instance (UDI) certificates required for secure communications between CUCM clusters and endpoints.
Compatible with CUCM versions 10.5(2)SU8 and later, this utility addresses scenarios where legacy certificate chains cause installation failures for newer firmware packages. Administrators deploying IP Phone 7800/8800 Series firmware releases (e.g., 12.1(1)SR1) or upgrading CUCM clusters to post-10.0.1 versions will require this package to avoid errors such as “The selected file is not valid” during installation.
Key Features and Improvements
-
Certificate Chain Validation
Resolves incompatibilities between pre-10.0.1 CUCM clusters and modern firmware by regenerating SHA-256-based UDI certificates. This prevents installation failures for k3-type COP files, which enforce stricter cryptographic standards. -
Cluster-Wide Synchronization
Automates the distribution of updated certificates across all CUCM nodes, ensuring consistency in multi-node environments. This eliminates manual intervention when restarting services like Cisco Trust Verification Service (TVS) or TFTP. -
Compatibility with Hybrid Deployments
Supports mixed clusters transitioning from on-premises CUCM to Cisco Webex Calling by maintaining backward compatibility with legacy hardware while enabling newer security protocols. -
Error Mitigation
Addresses specific CUCM alerts related to expired or mismatched certificates, such as CVE-2024-20356 vulnerabilities linked to memory leaks in SAN fabric services.
Compatibility and Requirements
| Component | Supported Versions/Models |
|---|---|
| Cisco Unified CM | 10.5(2)SU8, 11.5(1)SU5, 12.5(1)SU2 |
| IP Phones | 7800 Series, 8800 Series |
| Security Protocols | TLS 1.2, SHA-256 |
| Dependencies | ciscocm.version3-keys.cop.sgn (pre-10.0.1 clusters) |
Note: For clusters running CUCM 9.x or earlier, Cisco recommends upgrading to a minimum supported version before applying this utility.
Download and Support
To obtain ciscocm-ucm-resetudi.k3.cop.sgn, visit the Cisco Software Download Center and navigate to:
Downloads Home > Products > Unified Communications > Call Control > Unified Communications Manager (CallManager).
For verified access without a Cisco service contract, IOSHub.net provides secure distribution of this utility. Users must confirm CUCM version compatibility and review the Cisco IP Phone Firmware Support Policy before installation.
Technical Assistance:
Cisco TAC engineers recommend cross-referencing the utility with the latest CUCM Security Hardening Guide to ensure compliance with organizational PKI policies.
Conclusion
The ciscocm-ucm-resetudi.k3.cop.sgn serves as a foundational tool for maintaining cryptographic integrity in Cisco UC environments. By addressing certificate mismatches and streamlining cluster-wide security updates, it reduces downtime risks during critical firmware upgrades. System administrators should prioritize this utility when preparing for CUCM version transitions or deploying newer IP phone firmware packages.
For detailed installation workflows, refer to Cisco’s “Regenerate Certificates in Unified Communications Manager” documentation or contact IOSHub.net’s support team for license-specific queries.
