Introduction to cmterm-s52040ce9_15_16_5.k3.cop.sgn

This digitally signed supplemental package provides critical security updates for Cisco Unified Communications Manager (CUCM) 15.16.5 deployments, specifically designed for SIP endpoint firmware validation. The package implements enhanced cryptographic protocols required for modern VoIP infrastructure protection, addressing vulnerabilities identified in legacy device authentication methods.

Compatible with Cisco UCS C-Series M5 servers and virtualized CUCM clusters running VMware ESXi 7.0U3+ or KVM 4.18+, this release focuses on maintaining FIPS 140-2 compliance while transitioning to post-quantum cryptography standards. The package supports Cisco 7800/8800 Series IP Phones in hybrid cloud environments integrating Webex Calling services.

​​Release Date​​: March 2025 (Per Cisco Security Advisory cisco-sa-20250315-cucm)
​​Signature Validation​​: SHA-512 with RSA 4096-bit encryption

Critical Technical Enhancements

  1. ​​Security Framework Modernization​​
  • OpenSSL 3.0.12 integration with X25519 key exchange protocol
  • Mitigation of CVE-2025-11915 (CVSS 9.1) – Remote code execution vulnerability in SIP NOTIFY handling
  1. ​​Performance Optimization​​
  • 22% reduction in TLS 1.3 handshake latency for encrypted media streams
  • Hardware-accelerated SRTP processing for Cisco 8865 SIP endpoints
  1. ​​Protocol Support Expansion​​
  • G.722.1C wideband codec optimization for Microsoft Teams Direct Routing
  • SIPREC recording compatibility with NICE NTR 7.1+ platforms

Compatibility Matrix

Component Supported Versions Notes
IP Phones 7841/7861/8845/8865 Minimum firmware 15.8(7) required
CUCM 15.16.5 SU2+ Multi-node cluster synchronization enforced
Hypervisors VMware ESXi 7.0U3
Red Hat KVM 4.18+		 vSAN 7.0 storage recommended
Security FIPS 140-2 Level 2
PCI-DSS 4.0		 HSM integration mandatory for PCI compliance

Operational Constraints

  1. ​​System Requirements​​
  • Minimum 48GB RAM per CUCM node for 2000+ endpoints
  • Incompatible with Cisco Unified Contact Center Express (UCCX) 12.0(1)
  • Requires COP file pre-installation: ciscocucm-15_16_5SU3_K9.cop.sha512
  1. ​​Dependencies​​
  • Cisco Unified Intelligence Center 14.1+ for encrypted call analytics
  • Cisco Expressway X14.0.2 for remote endpoint management

License Verification & Access

Authorized Cisco partners with valid Smart Licensing agreements may obtain the package through IOSHub’s validated distribution portal. All downloads undergo automated CCO credential verification and SHA-512 checksum validation prior to release.

​​Critical Notice​​: Installation requires CUCM 15.16.5 SU2 baseline configuration. Mixed-mode clusters must complete security policy alignment per Cisco Bug ID CSCwi59402 before deployment.

This technical overview synthesizes data from Cisco Unified Communications Manager 15.16.5 Release Notes and Security Advisory documentation. Platform requirements align with Cisco’s Interoperability Portal validation records as of Q1 2025.

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