(downloaded from reputable sources if not using a Cisco contract, such as emetrotel ).
Modify the line to match the 8.5.4 firmware string exactly (excluding the file extension): SIP41.8-5-4S Use code with caution. Step 3: Initiate the Factory Reset / Upgrade
Cisco Options Package files (used primarily when uploading directly to a Cisco Unified Communications Manager (CUCM) server). cmterm 7941 7961 sip 8 5 4 zipl
When the lights on the line buttons start blinking, release the # key and dial (default settings reset).
To understand the significance of version 8-5-4, one must first appreciate the distinction between Cisco’s proprietary Skinny Client Control Protocol (SCCP) and the open-standard SIP. While the 7941 and 7961 phones ship defaulting to SCCP for use with Cisco Unified Communications Manager (CUCM), the proliferation of open-source PBX systems like Asterisk, FreePBX, and platforms such as 3CX necessitated a shift. The release of cmterm-7941_7961-sip firmware transformed these proprietary handsets into standards-compliant devices, capable of integrating with virtually any modern VoIP platform. Version 8-5-4 specifically addresses many of the handshake and negotiation complexities that plagued earlier iterations, offering a robust solution for businesses avoiding vendor lock-in. (downloaded from reputable sources if not using a
To force the phone to look for the new firmware, perform a factory reset: Unplug the power (or PoE) from the phone.
This specific firmware version is notable for several reasons: When the lights on the line buttons start
Once you have downloaded cmterm-7941_7961-sip.8-5-4.zip , you must prepare the files for the phone.
The phone will reboot and begin downloading files from your TFTP server. Do power off the phone during this process. Important Compatibility Note Cisco IP Phone 7941/7961 Firmware Load 8.5(2) SCCP
Create a file named SEP[your-phone-mac-address].cnf.xml (all uppercase). This file tells the phone which firmware to load. A basic SIP SEP.xml file looks like this:
Depending on your call control environment, you will handle this firmware package in one of two ways.