Error 0x80EF01E5

Value: -2131820059 | 0x80EF01E5 | 2163147237

What does it mean ?

RTC_E_STATUS_CLIENT_AMBIGUOUS  
Ambiguous
Value: 485 | 0x01E5 | 0b0000000111100101

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