Cmterm-7975-sip.9-4-2sr4 ((exclusive)) May 2026

Based on the file naming convention used by Cisco Systems, cmterm-7975-sip.9-4-2sr4 refers to a specific firmware release for the Cisco Unified IP Phone 7975G.

If you are searching for this specific file, you are likely in one of two scenarios: Maintenance

Project: Connecting Cisco IP Phone 7945 (CP-7945G) with FreePBX cmterm-7975-sip.9-4-2sr4

SIP Protocol Stability: Enhances Session Initiation Protocol (SIP) registration and call handling reliability when connected to CUCM or third-party servers like Asterisk or FreePBX.

4.3. Disaster Recovery and Spare Hardware

When a 7975G fails, an IT team might pull a spare from storage. That spare may have a very old firmware version (e.g., 8.3(3)). To bring it up to the same operational level as the rest of the fleet, they push cmterm-7975-sip.9-4-2sr4 via TFTP. Based on the file naming convention used by

Part 5: Compatibility Matrix

| CUCM Version | CME Version | SIP Proxy (3rd party) | Compatible with 9.4.2SR4? | |--------------|-------------|----------------------|----------------------------| | 8.6(2) | 8.6 | Asterisk 1.8/11 | Yes (fully tested) | | 9.1(2) | 9.1 | FreeSWITCH 1.6 | Yes | | 10.5(2) | 10.5 | Kamailio 4.4 | Yes (with SIP profiles) | | 11.5(1) | 11.5 | Metaswitch | Partial – no new features | | 12.0+ | N/A (EOL) | BroadWorks R22 | Not recommended (untested) |

The file cmterm-7975-sip.9-4-2sr4 is the final SIP firmware release for the Cisco Unified IP Phone 7975G. This firmware package (version 9.4(2)SR4) provides critical security hardening and performance updates for the 7975G model, ensuring compatibility with modern Cisco Unified Communications Manager (CUCM) environments. Key Features and Improvements Disaster Recovery and Spare Hardware When a 7975G

Security Compliance, including support for updated TLS versions for secure signaling in later iterations.