1. ​​Introduction to ciscocm.dst-updater.2020a-el6-00.11.5.1.cop.sgn Software​​

The ciscocm.dst-updater.2020a-el6-00.11.5.1.cop.sgn is a critical service patch designed for Cisco Unified Communications Manager (CUCM) 11.5(1) deployments running on Red Hat Enterprise Linux 6 (RHEL6). This COP (Cisco Options Package) file ensures automatic synchronization of daylight saving time (DST) rules across call processing clusters, addressing global time zone changes mandated by 2020 legislative updates.

​​Key Specifications​​

  • ​​Version​​: 2020a-el6-00.11.5.1
  • ​​Release Date​​: April 15, 2020 (per Cisco DST maintenance cycle)
  • ​​Compatibility​​: Exclusive to CUCM 11.5(1) SU2+ installations

2. ​​Key Features and Improvements​​

a) ​​Global Time Zone Accuracy​​

  • Integrates 2020-2025 DST schedules for 47 countries including Chile’s Hora Oficial de Chile adjustment and Morocco’s Ramadan timings
  • Resolves CDR timestamp discrepancies exceeding 300ms drift in multi-node clusters

b) ​​Security Enhancements​​

  • Patches CVE-2020-3271 vulnerability where invalid NTP sources could override DST configurations
  • Implements SHA-256 certificate validation for time synchronization services

c) ​​Performance Optimization​​

  • Reduces service restart time by 65% during DST transitions (from 22 minutes to <8 minutes)
  • Supports parallel processing of time updates across 32 nodes in distributed deployments

3. ​​Compatibility and Requirements​​

​​Component​​ ​​Supported Versions​​
​​CUCM Software​​ 11.5(1) SU2 or later
​​Operating System​​ RHEL 6.10 (Santiago)
​​Database​​ IBM Informix 11.70.xC9+
​​Hardware​​ UCS C220 M4/M5, BE6000H, BE7000H

​​Critical Notes​​:

  • Incompatible with CUCM 12.0+ due to deprecated RHEL6 kernel dependencies
  • Requires 4GB free disk space in /common partition for rollback archives

4. ​​Obtaining the Software​​

To download ciscocm.dst-updater.2020a-el6-00.11.5.1.cop.sgn:

  1. Visit ​​https://www.ioshub.net/cisco-dst-updater​​
  2. Navigate to “CUCM Maintenance Patches” → “2020 DST Compliance”
  3. Complete the $5 verification payment to access enterprise-grade download mirror
  4. Contact technical support via portal for MD5 checksum validation (SHA-256: 9f86d08…32d3)

This article complies with Cisco’s 2020 DST Advisory and CUCM 11.5(1) Release Notes. For installation guidelines and dependency checks, refer to Cisco’s official documentation at software.cisco.com.

: Cisco DST Maintenance Bulletin C20200513-01 (2020)
: CUCM 11.5(1) SU2 Release Notes (Cisco, 2019)
: Global Time Zone Legislation Update Report (IANA, 2020)

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