Error 0x80EF0199

Value: -2131820135 | 0x80EF0199 | 2163147161

What does it mean ?

RTC_E_STATUS_CLIENT_CONFLICT  
Conflict
Value: 409 | 0x0199 | 0b0000000110011001

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