This identifier represents a "Cisco Options Package" (COP) or zip file containing the SIP software load for the 7975 series.
: Indicates a Communications Manager Terminal software file. 7975 : Specifically for the Cisco 7975G model. sip : The protocol used (as opposed to SCCP/Skinny). 9-4-2sr4 : The specific version, 9.4(2) Service Release 4 . Key Features and Fixes cmterm-7975-sip.9-4-2sr4
: Includes signed (authenticated) image files to prevent tampering during the upgrade process. This identifier represents a "Cisco Options Package" (COP)