Cmterm-7975-sip.9-4-2sr4

: Addresses bugs found in earlier 9.x releases, making it the preferred choice for SIP environments.

This version is often cited as the final or most stable SIP firmware for the 7900 series. cmterm-7975-sip.9-4-2sr4

: Designed for use with CUCM 6.0 and later, though it is frequently used in open-source PBX environments. Installation Overview : Addresses bugs found in earlier 9