Error 0x80EF01E8

Value: -2131820056 | 0x80EF01E8 | 2163147240

What does it mean ?

RTC_E_STATUS_NOT_ACCEPTABLE_HERE  
Not Acceptable Here
Value: 488 | 0x01E8 | 0b0000000111101000

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