Risks & cautions
This is how you load the firmware if you do not have a Cisco CallManager. cmterm7975sip942sr4zip upd
The file cmterm7975sip942sr4.zip contains the necessary firmware to run the Cisco 7975G phone on a SIP network (such as Asterisk, FreePBX, or 3CX) rather than the proprietary Cisco SCCP (Skinny) protocol. Risks & cautions This is how you load