Fixes for intermittent one-way audio or static issues reported in previous 9.4(2) iterations. Certificate Handling:
Project: Connecting Cisco IP Phone 7945 (CP-7945G) with FreePBX
After 9.4(2)SR4, Cisco released only a handful of patches (e.g., 9.4(2)SR5, 9.4(2)SR6) but never a new major version (10.x). Thus, this firmware lineage marks the for the 7975G SIP stack.