To clear out the existing SCCP images and force the phone to pull down the new configuration, execute a factory reset: Unplug the network / PoE cable from the back of the phone.

The string refers to a firmware update package for the Cisco Unified IP Phone 7975G . This specific file is the SIP (Session Initiation Protocol) firmware version 9.4(2)SR4 , which is often considered the final or most stable SIP load for this legacy phone model. Key Details about Version 9.4(2)SR4

Download the .cop.sgn or the .zip containing the individual firmware files from the Cisco Software Central portal. Log into . Navigate to Software Upgrades > Install/Upgrade .

: Fixes for memory leaks and registration issues that were common in earlier 9.x SIP loads. How to Access Official downloads require a valid Cisco Service Contract

The file contains the SIP firmware load 9.4(2)SR4 for the Cisco Unified IP Phone 7975G . This specific update is widely regarded as the final and most stable SIP firmware release for the 7975G model.