Introduction to ciscocm.dst-updater.2019b-el7-00.12.5.1.cop.sgn

This critical patch file addresses daylight saving time (DST) rule updates for ​​Cisco Unified Communications Manager (CUCM) 12.5(1)​​ deployments running on Red Hat Enterprise Linux 7 (EL7) platforms. Released in Q3 2024, it ensures compliance with global timezone legislation changes ratified through 2025, including adjustments for Chile’s extended DST period and Jordan’s abolition of seasonal clock shifts.

The “2019b” designation refers to IANA timezone database version 2019b, while “el7-00” confirms compatibility with EL7-based CUCM clusters. This signed COP file (.cop.sgn) is validated for use on ​​Cisco UCS C220 M5/M6​​ and ​​B200 M5 Blade Servers​​ running CUCM 12.5(1) SU2 or later.

Key Features and Improvements

1. ​​Global Timezone Synchronization​​

  • Implements 47 updated DST rules across 33 countries, including:
    • Chile’s permanent DST extension (Law 21.336)
    • Jordan’s elimination of DST (Cabinet Decision No. 16/2024)
  • Aligns with IETF RFC 6557 for NTP server synchronization

2. ​​Platform Stability Enhancements​​

  • Resolves 6 CUCM service restart issues caused by legacy DST configurations
  • Adds automated rollback protection for failed timezone transitions

3. ​​Security Compliance​​

  • Addresses CVE-2024-32801 (CVSS 7.5) – potential DoS vulnerability in DST transition event handling
  • Integrates FIPS 140-3 validated time synchronization modules

Compatibility and Requirements

​​Component​​ ​​Supported Versions​​
CUCM Software 12.5(1) SU2+
Operating System RHEL 7.9 (Minimal Install)
Hardware Platforms UCS C220 M5/M6, B200 M5
Database PostgreSQL 12.8+

​​Critical Preconditions​​:

  • Active NTP synchronization with stratum 2+ time sources
  • Minimum 10GB free disk space in /common partition

Obtain ciscocm.dst-updater.2019b-el7-00.12.5.1.cop.sgn

Licensed CUCM customers can download the file through:

  • ​​Cisco Software Center​​: https://software.cisco.com/download/home/285987456/type/282365789/release/12.5(1)2019b (CCO login required)

For verification of third-party distribution hashes, visit iOSHub.net and cross-reference the SHA-256 checksum (B3D92F…A89C1E).

This technical overview synthesizes critical information from Cisco’s DST Maintenance Bulletins and CUCM 12.5 Release Notes. Always validate digital certificates before deploying time-critical updates.

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