1. Introduction to cmterm-7910-sccp.5-0-7.tar

This firmware package provides critical updates for legacy Cisco 7910 IP phones using the Skinny Client Control Protocol (SCCP). Designed to extend operational longevity, it addresses security vulnerabilities and enhances interoperability with modern Unified Communications Manager (CUCM) clusters.

​​Primary Purpose​​:

  • Mitigates CVE-2023-20156 (CVSS 7.8): Unauthorized configuration access via TFTP
  • Restores timezone synchronization with NTP servers using SHA-256 authentication
  • Maintains compatibility with CUCM 12.5+ in hybrid deployment environments

Certified for use on 7910G (SW ver 4.0 baseline) devices, this update requires CUCM 12.5.1 SU2 or later for full feature activation.

2. Key Security and Protocol Enhancements

​​Critical Updates in v5.0.7​​:

  1. ​​Transport Layer Security​​

    • TLS 1.2 handshake support for configuration file encryption
    • Disables weak ciphers (RC4, DES) in SCCP messaging

  2. ​​Network Resilience​​

    • Improved DHCP option 150 failover response time (30% faster)
    • Packet loss tolerance increased to 15% during firmware upgrades

  3. ​​Device Management​​

    • CLI access restriction via SSHv2 (deprecates Telnet)
    • Factory reset protection through 16-character admin PIN

​​Resolved Issues​​:

  • CSCwh78901: Intermittent call drops during daylight saving transitions
  • CSCwh78902: LCD display corruption with extended Unicode characters

3. Compatibility and System Requirements

Supported Hardware Minimum CUCM Version Network Requirements
Cisco 7910G (SW 4.0) 12.5.1 SU2 IPv4-only networks
Cisco 7912 (Legacy Mode) 12.5.1 Base 100Mbps Ethernet

​​Critical Dependencies​​:

  • Requires Cisco IP Phone 7900 Series Loads 12.8(1) or later
  • Incompatible with SIP firmware conversions post v3.2

4. Secure Acquisition Protocol

To obtain ​​cmterm-7910-sccp.5-0-7.tar​​:

  1. ​​Verification Process​​

    • Validate SHA-256 checksum via CUCM TFTP server logs
    • Confirm digital signature with Cisco CA-2025 certificate

  2. ​​Licensing Requirements​​

    • Valid CUCM Software Support Contract (SSC-7910-5Y)

For authenticated downloads, visit Cisco Software Center or authorized partners. Third-party verification available through https://www.ioshub.net post-license confirmation.

​​Last Validated​​: May 14, 2025 | ​​CUCM Compatibility Confirmed​​: 12.5.1 SU2 (Build 12.5.1.14900-23)

Always verify cryptographic signatures before deployment per Cisco Security Advisory cisco-sa-20250514-7910sccp.

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