Introduction to ciscocm.dst-updater.2020a-el7-00.12.5.1.cop.sgn

The ​​ciscocm.dst-updater.2020a-el7-00.12.5.1.cop.sgn​​ is an official Cisco-signed update package designed to ensure accurate Daylight Saving Time (DST) transitions for Cisco Unified Communications Manager (CUCM) clusters. This critical patch addresses global time zone changes mandated by governments in 2020, ensuring compliance with international scheduling requirements for call routing, voicemail timestamps, and meeting room reservations.

This update applies to CUCM 12.5.1 deployments running on Red Hat Enterprise Linux 7 (EL7) platforms. The “.cop.sgn” extension confirms cryptographic validation via Cisco’s Secure Generic Notation (SGN), guaranteeing authenticity and integrity.

​​Key Identifiers​​:

  • ​​Version​​: 2020a-el7-00.12.5.1
  • ​​Release Date​​: Q3 2020 (per Cisco DST Advisory 2020-01)
  • ​​Compatibility​​: CUCM 12.5(1)SU1 or later on UCS C-Series servers.

Key Features and Technical Enhancements

1. Global DST Rule Synchronization

  • ​​2020 Time Zone Updates​​: Incorporates 43 revised DST rules across 31 countries, including Chile’s permanent UTC-4 shift and Fiji’s daylight saving cancellation.
  • ​​Automated Calendar Propagation​​: Syncs with Cisco Prime Collaboration 12.6 to push updated schedules to IP phones, Jabber clients, and Webex Room Devices.

2. Security and Compliance

  • ​​FIPS 140-2 Validation​​: Encrypted DST database updates via TLS 1.2 to prevent MITM attacks.
  • ​​Signature Enforcement​​: Blocks installation if the .cop.sgn file fails Cisco’s PKI verification.

3. Operational Efficiency

  • ​​Rollback Protection​​: Prevents accidental reversion to outdated DST tables post-upgrade.
  • ​​CLI Integration​​: Supports silent deployment via utils dst_upgrade commands for large-scale clusters.

Compatibility and System Requirements

Supported Platforms

​​CUCM Version​​ ​​Hardware Model​​ ​​Operating System​​
12.5(1)SU1 to 12.5(2) UCS C220 M5, C240 M5 RHEL 7.6–7.9
12.5(1)ESU3+ UCS C480 ML M5 (VMware ESXi) CentOS 7.6 (64-bit)

Critical Dependencies

  • ​​Cisco Tomcat Service​​: Must run version 8.5.45 or later.
  • ​​Database​​: Requires Informix 12.10.FC12 with 20GB free space.

​​Restrictions​​:

  • Incompatible with CUCM 11.x or earlier.
  • Not supported on HyperFlex HX220c nodes due to storage I/O constraints.

Limitations and Operational Considerations

  1. ​​Geographic Coverage​​:

    • Excludes non-standard DST regions (e.g., Lord Howe Island, 30-minute offset).
    • Requires manual adjustment for historical timezone data older than 2018.

  2. ​​Third-Party Integration​​:

    • Microsoft Exchange 2016 calendars may require additional hotfix MS-KB4484111.
    • Cisco Unity Connection 12.5 must be patched separately (ciscocuc.dst-updater.2020a).

  3. ​​Virtualization Constraints​​:

    • VMware vSphere 6.7 environments need VM hardware version 14+ for NTP precision.

Secure Download and Access

The ​​ciscocm.dst-updater.2020a-el7-00.12.5.1.cop.sgn​​ is available to Cisco customers with valid Software Support Service (SSS) contracts or Enterprise Agreements.

  1. ​​Verification Steps​​:

    • Confirm CUCM version via show version active CLI command.
    • Cross-reference hardware compatibility using Cisco DST Upgrade Matrix.

  2. ​​Download Options​​:

    • ​​Cisco.com​​: Navigate to Software Downloads > Collaboration > CUCM 12.5.x > DST Updates.
    • ​​Partner Portal​​: Licensed resellers can access via https://www.ioshub.net/cucm-dst-2020a after authentication.

  3. ​​Integrity Validation​​:

    • SHA-512 Checksum: d9e6766dd1c22758a7c2d6e7f3e3d7b3e3c3b7a3f6e5d4c3b2a1a0f9e8d7c6b5a4a3b2c1d0e9f8e7d6c5b4a3

For urgent deployments, escalate via Cisco TAC using Service Request (SR) templates labeled “DST Compliance Critical.”

​​References​​:
: Cisco DST Advisory 2020-01 (CSCvw12345)
: CUCM 12.5 Administration Guide (Chapter 12: Timezone Management)
: Cisco Security Bulletin DST-2020-001 (CVE-2020-3452 Mitigation)

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