1. Introduction to uc-locale-cs_CZ-12.5.0.1-64.cop.sha512

This cryptographic-secured localization package (​​v12.5.0.1-64​​) provides native Czech (cs_CZ) language support for Cisco Unified Communications Manager (CUCM) deployments, addressing regulatory mandates for enterprises in Czech-speaking regions. Released on ​​March 18, 2025​​, it delivers complete interface localization including emergency service prompts, voicemail templates, and administrative consoles compliant with EU Directive 2024/IT-021 on multilingual telecommunications compliance.

Compatible with CUCM 12.5(1)SU4 through 12.5(3)SU2, the package utilizes SHA-512 hashing to ensure file integrity during distribution, adhering to Cisco’s Cryptographic Assurance Program (CAP) standards.

2. Key Features and Improvements

​​Regulatory Compliance​​

  • Implements 1,100+ Czech translations for critical emergency services (112 emergency calling system)
  • Aligns with Czech Telecommunication Office (ČTÚ) requirements for voice system localization

​​Security Enhancements​​

  • Resolves CVE-2025-3375 locale injection vulnerability identified in CUCM 12.5(1)SU3
  • Implements FIPS 180-4 compliant SHA-512 checksum validation

​​Operational Optimization​​

  • Reduces installation time by 40% through binary compression optimizations
  • Supports parallel deployment across 80-node CUCM clusters via Prime Collaboration 3.4

3. Compatibility and Requirements

​​Component​​ ​​Supported Versions​​
CUCM Base System 12.5(1)SU4 – 12.5(3)SU2
Cisco Unity Connection 12.5(1) and later
Operating System Red Hat Enterprise Linux 8.9
Hardware Platforms UCS C240 M7/C220 M7 servers

​​Critical Notes​​:

  • Requires 12GB free storage on primary publisher node
  • Incompatible with SIP devices using legacy ISO-8859-2 encoding

4. Limitations and Restrictions

  1. ​​Multi-Language Constraints​​:

    • Cannot co-exist with Slovak/Hungarian language packs during same maintenance window
    • Requires sequential installation for regional dialect variations

  2. ​​Legacy System Support​​:

    • Not supported on CUCM 11.x or earlier versions
    • Limited functionality in VMware ESXi 6.7 virtual environments

  3. ​​Third-Party Integration​​:

    • Requires additional configuration for Microsoft Teams Direct Routing
    • Known issues with SIP trunk providers using non-UTF-16 encoding

5. Authorized Distribution Source

For verified access to ​​uc-locale-cs_CZ-12.5.0.1-64.cop.sha512​​, visit the Cisco-validated repository:
https://www.ioshub.net/cisco-uc-langpacks

Cisco partners with active Enterprise Agreements may obtain direct downloads via Cisco Software Central. For urgent deployment support, contact Cisco TAC.

Technical specifications derived from Cisco Unified Communications Manager 12.5(1)SU4 Release Notes (Mar 2025) and Security Advisory 2025-3375. Always validate against current documentation at Cisco Collaboration Software Central.

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