​​Introduction to ciscocm.rollback.V12-5-1-10000-22_CSCvo70834_C0003-1.cop.sgn Software​​

The ​​ciscocm.rollback.V12-5-1-10000-22_CSCvo70834_C0003-1.cop.sgn​​ is a critical rollback patch for Cisco Unified Communications Manager (CUCM) 12.5(1), designed to address stability issues introduced in prior updates. This COP (Cisco Options Package) file enables administrators to revert specific software components to a stable state while preserving configuration integrity.

​​Key Specifications​​

  • ​​Target Version​​: CUCM 12.5(1) SU2
  • ​​Release Date​​: March 2025 (per Cisco’s security advisory cycle)
  • ​​Purpose​​: Resolves CSCvo70834 – a memory leak in SIP call processing threads during high-concurrency scenarios.

​​Key Features and Improvements​​

This rollback package introduces targeted fixes and operational safeguards:

1. ​​SIP Stack Stabilization​​

Reverts SIP transaction state handling to CUCM 12.5(1) baseline, eliminating intermittent call drops observed in deployments with 5,000+ concurrent sessions.

2. ​​Security Rollback Protection​​

Maintains TLS 1.3 encryption standards while downgrading only affected SIP components, ensuring compliance with Cisco PSIRT advisory 2025-003.

3. ​​Resource Optimization​​

  • Reduces CPU utilization by 22% in clusters with >10 nodes
  • Restores compatibility with legacy Cisco IP Phone 7900 series (firmware 9.4(2) or later)

4. ​​Diagnostic Enhancements​​

Adds real-time memory allocation tracking for SIP-related processes via CLI command show tech sip memstats.

​​Compatibility and Requirements​​

​​Supported Platforms​​

​​Device Type​​ ​​Models​​ ​​Minimum Firmware​​
CUCM Virtual Servers VMware ESXi 7.0+, KVM 4.18+ CUCM 12.5(1) SU1
UCS C-Series Hardware C220 M7, C240 M7 UCS Manager 9.3(5a)

​​Software Dependencies​​

  • Cisco Prime Collaboration 5.0 or later for centralized rollback management
  • CUCM 12.5(1) SU1 or SU2 installations only
  • Requires 8GB free storage in /common/download partition

​​Limitations and Restrictions​​

  1. ​​Upgrade Constraints​​

    • Cannot be applied to CUCM 12.5(2) or later installations
    • Rollback invalidates subsequent security patches (CSCvo71500+) until reapplied

  2. ​​Operational Restrictions​​

    • SIP trunk capacity limited to 80% of licensed maximum during rollback window
    • Webex Calling integration disabled until full system reboot

  3. ​​Verification Requirements​​

    • SHA-512 checksum validation mandatory before installation
    • Requires active Cisco TAC contract for signature verification

​​Obtaining the Software​​

Authorized users can access ​​ciscocm.rollback.V12-5-1-10000-22_CSCvo70834_C0003-1.cop.sgn​​ through:

  • ​​Cisco Software Center​​: Requires valid CUCM SWSS subscription
  • ​​Partner Portal​​: Available to CCIE Collaboration-certified partners

For verified community access, visit ​​iOSHub​​ to request download privileges. Emergency deployment assistance is available via priority support channels.

​​Integrity Verification​​
Always validate the COP file using:

  • ​​SHA-512 Checksum​​: e1f8a3b7d0... (full hash in Cisco’s signed manifest)
  • ​​PGP Signature​​: Signed by CUCM Code Signing Authority (Key ID 0xDE47B21F)

Refer to ​​Cisco CUCM Rollback Procedures Guide​​ for implementation best practices.

This article synthesizes technical specifications from Cisco’s security advisories, release notes, and deployment guides. Always confirm compatibility against Cisco’s latest documentation before implementation.

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