I noticed after upgrading phone to 1.12.4 when an incoming call is parked the light goes blank when it should flash red. If I downgrade park works fine.
Ok I believe I have located the problem and correct me if I'm wrong but I believe this is a template issue with the 3cx firmware update. Upon comparing the settings between my X4U (1.0.0) which is working correctly and my X6U (1.0.1) which is not I found the "BLF using LED" dsskey status LED on the X6U was set to off. I attempted to change it but I believe when the phone provisions to my 3cx it reverts back to off.