Error 0x80EE006C

Value: -2131885972 | 0x80EE006C | 2163081324

What does it mean ?

RTC_E_SIP_AUTH_TIME_SKEW  
Authentication failure because of time skew between client and server
Value: 108 | 0x006C | 0b0000000001101100

Where does it come from ?

FACILITY_RTC_INTERFACE  
RTC - Real-time Communications
Value: 238 | 0x0EE | 0b11101110

Other Errors for FACILITY_RTC_INTERFACE