Error 0x80EF017C

Value: -2131820164 | 0x80EF017C | 2163147132

What does it mean ?

RTC_E_STATUS_REDIRECT_ALTERNATIVE_SERVICE  
Alternative Service
Value: 380 | 0x017C | 0b0000000101111100

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