I've got a couple of old Cisco 7970 IP phones connected to an ancient CUCM 7.1 server in a lab. I've searched but I can't find the final SCCP firmware for this model anywhere. Its been EoL for ages, so the images aren't on CCO anymore.
I've found some earlier versions floating around, and I've upgraded them to 9-4-2SR2, but I can't find the final version that was released. The filename is ' cmterm-7970_7971-sip.9-4-2SR3-1.k3.cop.sgn' I think.