Error 0x80EE000C

Value: -2131886068 | 0x80EE000C | 2163081228

What does it mean ?

RTC_E_SIP_TIMEOUT  
SIP Transaction timed out
Value: 12 | 0x000C | 0b0000000000001100

Where does it come from ?

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

Other Errors for FACILITY_RTC_INTERFACE