"cmterm-7975-sip.9-4-2sr4" refers to the SIP firmware version 9.4(2)SR4 Cisco IP Phone 7975G Go to product viewer dialog for this item.
: Older VoIP hardware is a common target for network exploits; Service Releases (SR) patch these holes. Enhance Stability cmterm-7975-sip.9-4-2sr4
Problem : Firmware fails to download (Error 4). "cmterm-7975-sip
. This is often one of the final stable maintenance releases for this legacy model. Cisco Community Firmware Types cmterm-7975-sip.9-4-2sr4
Update the Device Defaults