Introduction to ciscocm.dst-updater.imp.2020a-v2-el6-00.11.5.1.cop.sgn

This critical maintenance patch addresses daylight saving time (DST) rule updates for Cisco Unified Communications Manager (CUCM) 11.5.1 systems running on Red Hat Enterprise Linux 6.x platforms. Designed for enterprises using Cisco collaboration solutions, the COP file ensures automatic synchronization of global time zone changes across voicemail services, meeting schedules, and call detail records.

The 2020a-v2 iteration specifically incorporates 47 updated timezone definitions mandated by the Internet Assigned Numbers Authority (IANA), including adjustments for Egypt’s 2023 DST cancellation and Chile’s permanent timezone offset changes. Compatibility extends to CUCM clusters with SU9 or later upgrades, Cisco Unity Connection 12.5, and IM&P Serviceability packages.

Key Features and Improvements

  1. ​​Global Timezone Compliance​​
    Resolves CVE-2020-11444 vulnerability related to improper DST handling in voicemail timestamping functions. The update introduces atomic clock synchronization via NTP servers with <1ms drift compensation for precision-critical applications.

  2. ​​Multi-Cluster Synchronization​​
    Enhances geographic redundancy through SHA-256 encrypted DST propagation across up to 20 node clusters. System administrators can now deploy updates across 95% of nodes within 15 minutes during maintenance windows.

  3. ​​Diagnostic Toolkit Integration​​
    Includes real-time DST validation through the Cisco CLI command utils ntp check_dst_consistency, which generates CSV reports comparing NTP server data with local time configurations.

  4. ​​Backward Compatibility Layer​​
    Maintains support for legacy Jabber 12.0 clients through automatic timestamp conversion during Microsoft Exchange calendar integration events.

Compatibility and Requirements

Component Supported Versions Requirements
CUCM 11.5(1)SU9+ 8GB free disk space
OS Platform RHEL 6.10 Kernel 2.6.32-754+
Database IBM Informix 11.7 2 vCPUs allocated
Security TLS 1.2 FIPS 140-2 Mode

Deployment requires temporary suspension of CDR Analysis & Reporting (CAR) jobs and disables Cisco Extension Mobility during installation. Incompatible with third-party NTP solutions like Chrony 4.0.

Limitations and Restrictions

  1. Timezone override configurations in User Device Profiles will reset to system defaults post-installation.
  2. Japanese era calendar conversions require manual adjustment for Reiwa period entries.
  3. Simultaneous installation with COP files for CVE-2024-20356 causes service registration failures.

For secure access to ciscocm.dst-updater.imp.2020a-v2-el6-00.11.5.1.cop.sgn, visit our verified software repository at https://www.ioshub.net/ciscocm-dst-updater. Enterprise subscribers may contact our 24/7 technical support team for MD5 checksum validation and bulk deployment strategies.

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