Error 0x80EF019B

Value: -2131820133 | 0x80EF019B | 2163147163

What does it mean ?

RTC_E_STATUS_CLIENT_LENGTH_REQUIRED  
Length Required
Value: 411 | 0x019B | 0b0000000110011011

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