Error 0x00EF00B4

Value: 15663284 | 0x00EF00B4 | 15663284

What does it mean ?

RTC_E_STATUS_INFO_RINGING  
Ringing
Value: 180 | 0x00B4 | 0b0000000010110100

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