Error 0x80EF01E7

Value: -2131820057 | 0x80EF01E7 | 2163147239

What does it mean ?

RTC_E_STATUS_REQUEST_TERMINATED  
Request Terminated
Value: 487 | 0x01E7 | 0b0000000111100111

Where does it come from ?

FACILITY_SIP_STATUS_CODE  
SIP - Session Initiation Protocol (VoIP)
Value: 239 | 0x0EF | 0b11101111

Other Errors for FACILITY_SIP_STATUS_CODE