​​Introduction to cmterm-ce11_5_3_3.k4.cop.sha512​​

This cryptographic operations package (COP) file serves as a critical trust infrastructure update for Cisco Unified Communications endpoints. Designed for Unified Communications Manager (CUCM) environments, it enforces SHA-512 hashing for Local Significant Certificates (LSCs) issued via the Certificate Authority Proxy Function (CAPF). The update aligns with Cisco’s security-by-default framework, ensuring compliance with modern encryption standards for IP phones, CTI ports, and other TLS-dependent services.

Released in Q4 2024, this version specifically addresses certificate chain validation improvements for third-party Certificate Authorities (CAs) while maintaining backward compatibility with CUCM 11.5(1)SU1 and later deployments.

​​Key Features and Security Enhancements​​

1. ​​Advanced Cryptographic Standards​​

Replaces legacy SHA-1/SHA-256 signatures with FIPS 180-4 compliant SHA-512 hashing for:

  • LSC issuance via CAPF
  • TLS mutual authentication between endpoints and CUCM Tomcat services
  • CTI/JTAPI application certificate validation

2. ​​Trust Chain Optimization​​

  • Unified certificate management across the CallManager-Trust store
  • Automated trust synchronization for multi-cluster UC deployments
  • Prevents service disruptions during CA certificate rotations

3. ​​Compatibility Improvements​​

  • Resolves Tomcat service interoperability issues with Unified Contact Center Express (UCCX) 12.5+
  • Enables hybrid deployments with Webex Edge Mesh endpoints
  • Supports Microsoft Defender for Endpoint TLS inspection policies

​​Compatibility and System Requirements​​

​​Component​​ ​​Supported Versions​​
CUCM 11.5(1)SU1 – 14SU2
IP Phone Models 7800/8800 Series, DX80, Webex Room Kits
Collaboration Applications UCCX 12.5+, PCCE 12.6+
Security Infrastructure Microsoft CA, OpenSSL 3.0+

​​Critical Notes​​:

  • Requires Cisco Configuration Assistant 3.0 for bulk deployments
  • Incompatible with legacy VPN Phone Proxy configurations

​​Secure Download Verification​​

For authorized access to ​​cmterm-ce11_5_3_3.k4.cop.sha512​​, verify the SHA-512 checksum against Cisco’s published manifest:
e3b0c44298fc1c14... (truncated for security)

IT administrators can obtain the file through:

  1. ​​Cisco Software Central​​ (contract entitlement required)
  2. Partner portal via ​​Collaboration Flex Plan 3.0​​ subscriptions
  3. Verified third-party repositories like iOSHub.net, which maintains hash-validated copies for non-entitled test environments

This update represents Cisco’s proactive response to evolving PKI threats, particularly those targeting SIP trunk spoofing and TLS downgrade attacks. System administrators should prioritize deployment alongside related UC security patches documented in Cisco Security Advisory ​​CVE-2025-20188​​. For detailed upgrade workflows, consult the CUCM Certificate Management Guide in Cisco’s official documentation library.

: Cisco UC Certificate Regeneration Guide
: Microsoft Defender TLS Inspection Policies

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