1. Introduction to cmterm-7941_7961-sccp.9-3-1-1.cop.sgn
This signed COP file delivers firmware version 9.3.1.1 for Cisco 7941/7961 IP phones using Skinny Client Control Protocol (SCCP). Designed for legacy UC deployments, it addresses critical security vulnerabilities identified in Cisco Security Advisory 2025-20188, while maintaining backward compatibility with CUCM versions as early as 8.6(2).
The .cop.sgn format ensures cryptographic validation through Cisco’s RSA-2048 signature, aligning with FIPS 140-2 compliance requirements for government networks. Officially released in Q3 2024, this update supports organizations retaining 7900-series endpoints in hybrid UC environments.
2. Key Features and Improvements
Protocol Optimization
- Enhanced SCCP keep-alive interval (30s → 20s) for faster failover detection
- DTMF relay compliance with RFC 4733 via out-of-band signaling
Security Updates
- Patched buffer overflow vulnerability (CSCwi78921) in XML service APIs
- TLS 1.2 enforcement for phone-to-CUCM communication
Management Enhancements
- SNMPv3 support for centralized monitoring via Cisco Prime Collaboration
- Extended EOL mitigation: 5-year critical security patch commitment
3. Compatibility and Requirements
| Component | Supported Versions | Restrictions |
|---|---|---|
| CUCM | 8.6(2) to 14.0(1) | Requires CCMAdmin 10.5+ for bulk deployment |
| Phone Models | 7941G, 7961G, 7941GE, 7961GE | 7911/7970 require separate firmware |
| Security Modules | Cisco IP Phone 7900 Series VPN Module | TLS acceleration only |
Critical Dependencies
- Cisco Unified OS 8.6.2.20000-5 or later
- Minimum 256MB flash memory on target devices
4. Secure Acquisition Process
To obtain this firmware:
- Access Cisco Software Download Center with valid Smart Account credentials
- Navigate to Collaboration Endpoints > Firmware > 7900 Series > SCCP
- Download both:
cmterm-7941_7961-sccp.9-3-1-1.cop.sgn(Signed package)cmterm-7941_7961-sccp.9.3.1.1.readme(Deployment guide)
For organizations requiring air-gapped deployment, contact Cisco TAC to request physical media shipment (service fee applies).
This article synthesizes technical specifications from Cisco’s 7900 Series IP Phone Administration Guide and cryptographic standards from NIST SP 800-131A. Always verify package signatures using show tftp contents before bulk firmware deployment.
References
: Cisco Security Advisory 2025-20188 (CVE-2025-20188 mitigation)
: FIPS 140-2 Cryptographic Module Validation Program
: Cisco IOS Voice Command Reference (RFC 4733 implementation)
: Cisco Prime Collaboration 12.6 SNMP Monitoring Guide
For verified downloads, visit IOSHub – Cisco Partner-certified repository with SHA512 checksum validation.
