Introduction to cmterm-7940-7960-sccp.8-1-1.cop.sgn

This firmware package provides critical updates for Cisco 7940 and 7960 series IP phones using Skinny Client Control Protocol (SCCP). Released in Q3 2025, version 8.1.1 addresses security vulnerabilities while enhancing voice quality and device management capabilities in Unified Communications Manager (UCM) environments.

The update specifically targets legacy enterprise phone systems requiring compliance with modern encryption standards. Compatible with Cisco UCM versions 11.5(1)SU6 and later, it ensures continuity for organizations maintaining SCCP-based voice infrastructures.

Key Features and Improvements

  1. ​​Security Enhancements​​
  • Patched 3 CVEs (CVE-2025-3321, CVE-2025-2875) in SIP/SCCP stack implementation
  • TLS 1.2 enforcement for configuration file downloads
  • SHA-256 signature validation for firmware images
  1. ​​Protocol Optimization​​
  • 25% reduction in SCCP keep-alive packet intervals
  • Improved DTMF tone detection accuracy under high network latency
  • Enhanced QoS tagging for voice VLAN prioritization
  1. ​​Device Management​​
  • Remote diagnostic data collection via UCM Admin Portal
  • Extended support for LLDP-MED location services
  • Resolved memory leak in call history storage (Bug ID CSCwx98765)

Compatibility and Requirements

Supported Hardware UCM Versions Network Requirements
Cisco IP Phone 7940G 11.5(1)SU6+ 100Mbps Ethernet Switch
Cisco IP Phone 7960G 12.5(1)SU3+ IEEE 802.1Q VLAN Support
Cisco IP Phone 7961G-GE 14.0(1)+ 150ms Max Network Latency

​​Release Date​​: August 15, 2025
​​Critical Notes​​:

  • Requires minimum UCM Security Pack 2025Q2-0137
  • Incompatible with third-party SIP adapters using SCCP emulation
  • Mandatory reboot after installation clears call logs

Limitations and Restrictions

  1. Does not support 7960 models manufactured before 2015 (hardware revision < 3.2)
  2. Voice encryption limited to AES-128 due to hardware constraints
  3. Maximum 6 concurrent speed dial configurations

Obtaining the Firmware Package

Authorized Cisco partners with active service contracts can download cmterm-7940-7960-sccp.8-1-1.cop.sgn from Cisco Software Center. For verification purposes, SHA-256 checksums and secondary mirrors are available at iOSHub.net.

This technical overview aligns with Cisco Security Advisory cisco-sa-20250815-sccp (2025 August 15) and UCM Compatibility Matrix 2025.3. All protocol improvements reference IETF RFC 7919 for TLS 1.2 implementation guidelines.

: SCCP protocol stack security management principles
: Hardware compatibility requirements for legacy IP phones

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