Fixed issues in 2.9 LTSR CU4

Last published : Oct 16, 2026

HDX RealTime Optimization Pack 2.9 Cumulative Update 4 (CU4) contains all fixes that were included in HDX RealTime Optimization Pack 2.9, Cumulative Update 1, Cumulative Update 2, Cumulative Update 3, plus the following fix:

With this fix, HDX RealTime Optimization Pack 2.9 CU4 now supports FIPS-compliant Skype for Business environments.