Error 0x80EE0019

Value: -2131886055 | 0x80EE0019 | 2163081241

What does it mean ?

RTC_E_SIP_CALL_DISCONNECTED  
The Call has been disconnected
Value: 25 | 0x0019 | 0b0000000000011001

Where does it come from ?

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

Other Errors for FACILITY_RTC_INTERFACE