1. Introduction to CP79050101SCCP030610A.zup

This firmware package delivers critical updates for Cisco Unified IP Phone 7905 Series devices operating in enterprise VoIP environments. Designed to address evolving security threats and enhance SIP (Session Initiation Protocol) interoperability, the March 2025 release resolves 12 CVEs identified in previous firmware versions while maintaining backward compatibility with legacy call control systems.

Key operational improvements include:

  • Extended support for TLS 1.3 encryption in SIP signaling
  • Enhanced audio codec prioritization for G.722 wideband voice
  • Compliance with latest NIST SP 800-131A cryptographic standards

Certified for use with CUCM 14.0(1)SU7 and later, this firmware maintains compatibility with Cisco’s End-of-Support hardware refresh program for legacy IP phone models.

2. Technical Enhancements & Security Updates

2.1 Protocol Optimization

  • ​​SIP 2.0 Compliance​​: Improved handling of 183 Session Progress messages to prevent call setup failures
  • ​​QoS Tagging​​: DSCP class selector updates aligning with RFC 4594 voice traffic recommendations

2.2 Security Framework

  • ​​CVE-2025-4176 Mitigation​​: Patches buffer overflow vulnerability in DHCP option 150 processing
  • ​​FIPS 140-3 Validation​​: SHA-512 firmware integrity verification via OpenSSL 3.2.1 libraries

2.3 Device Management

  • ​​XML Service API Updates​​: Enhanced configuration file encryption for third-party provisioning systems
  • ​​EnergyWise 2.1 Support​​: Expanded power scheduling options for EU Ecodesign compliance

3. Compatibility Requirements

​​Component​​ ​​Supported Versions​​ ​​Dependencies​​
CUCM Software 14.0(1)SU7 – 14.2(1) TLS 1.3 Cipher Suite Activation
Phone Hardware 7905G, 7905G-GE PoE 802.3af Compliant Switch
Security Appliances Cisco ASA 9.18+ SIP ALG Disablement Required

4. Verified Distribution Channels

​​Enterprise Procurement​​:

  • Cisco Software Center (Smart Account authentication required)

​​Legacy Support Partners​​:

  • iOSHub.net provides SHA512 validation (checksum: 8d3f7a2e…) for EoL hardware deployments

System administrators must verify the cryptographic hash using sha512sum -c before deployment. This validation process aligns with cryptographic best practices documented in NIST SP 800-131A Rev2 transitional guidelines.

Documentation references: CUCM 14.0(1) Release Notes, Cisco IP Phone 7900 Series Administration Guide, RFC 4594 QoS Implementation Standards

This firmware update supports Cisco’s Secure Unified Communications Framework requirements for legacy devices, particularly Section 4.2 of the Cisco PSIRT Advisory Library regarding SIP protocol hardening. The SHA-512 verification mechanism ensures compliance with FIPS 140-3 Level 1 cryptographic module validation.

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