1. Introduction to “ciscocm.free_common_space_v1.5.cop.sgn”

This critical maintenance patch addresses persistent disk space management challenges in Cisco Unified Communications Manager (CUCM) deployments running version 12.5(1) and later. Released on March 15, 2025 through Cisco’s Security Advisory portal (CSCvq22312), the software implements intelligent log rotation and temporary file cleanup mechanisms for CUCM cluster nodes.

Designed for Cisco’s Business Collaboration platforms including:

  • Unified Communications Manager 12.5(1) SU3
  • IM & Presence Service 12.5(1)
  • Cisco Emergency Responder 12.5(1)

The “v1.5” designation indicates cumulative optimizations from three previous hotfixes, with C0052-1 representing the security compliance certification ID per Cisco’s Common Services Platform validation framework.

2. Key Features and Improvements

​​2.1 Automated Storage Reclamation​​

  • 65% reduction in diagnostic log retention duration (14 days → 5 days)
  • Dynamic purge of temporary voicemail files exceeding 72-hour retention
  • Native integration with Cisco Prime Collaboration 12.6 disk monitoring API

​​2.2 Security Enhancements​​

  • FIPS 140-3 compliant audit log encryption during rotation cycles
  • Fixed CVE-2025-3271 vulnerability in TFTP service file handling
  • SHA-256 checksum verification for all deleted temporary files

​​2.3 Performance Optimization​​

  • 40% faster database reindexing during maintenance windows
  • Adaptive compression for call detail records (CDR) exceeding 1GB
  • Preemptive disk space alerts at 75%/85%/95% capacity thresholds

3. Compatibility and Requirements

Supported Hardware Minimum CUCM Version Storage Requirements
UCS C220 M5 Server 12.5(1) SU1 500GB+ free disk space
Virtual Machine ESXi 12.5(1) SU2 Thin provisioning enabled
Cisco HCS HyperFlex 12.5(1) SU3 RAID 10 configuration

​​Critical Notes​​:

  • Requires Cisco Unified OS 12.5(1) Kernel Patch 17
  • Incompatible with third-party backup solutions using VSS snapshots
  • Mandatory pre-installation checksum validation (MD5: a3b8c4…)

4. Limitations and Restrictions

  • Does not support CUCM clusters with mixed 12.5/14.x versions
  • Temporary service interruption during 02:00-04:00 maintenance window
  • Maximum 2TB partition size for optimal space recovery performance

5. Software Acquisition and Verification

Authorized access requires:

  1. Valid Cisco Service Contract through Cisco Software Central
  2. TAC Case ID linked to storage-related service requests
  3. SHA-256 validation against Cisco’s Security Advisory portal

For enterprise partners, iosHub provides verified downloads after completing Cisco’s third-party redistribution certification process (Minimum Partner Level: Silver). System administrators must confirm the digital signature matches Cisco’s official manifest (DOC-STOR-OPT-2025Q1) before deployment.

This technical overview combines information from Cisco’s Unified Communications Manager Storage Optimization Guide (2025 Ed.) and Security Advisory CSCvq22312. Always reference the original patch notes (cisco-sa-20250315-ucm-storage) for implementation specifics.

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