Error 0x80EE0005

Value: -2131886075 | 0x80EE0005 | 2163081221

What does it mean ?

RTC_E_SIP_HEADER_NOT_PRESENT  
The SIP header is not present in the message
Value: 5 | 0x0005 | 0b0000000000000101

Where does it come from ?

FACILITY_RTC_INTERFACE  
RTC - Real-time Communications
Value: 238 | 0x0EE | 0b11101110

Other Errors for FACILITY_RTC_INTERFACE