Error 0x80EF01E1

Value: -2131820063 | 0x80EF01E1 | 2163147233

What does it mean ?

RTC_E_STATUS_CLIENT_TRANSACTION_DOES_NOT_EXIST  
Call Leg/Transaction Does Not Exist
Value: 481 | 0x01E1 | 0b0000000111100001

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