Error 0x80EE006B

Value: -2131885973 | 0x80EE006B | 2163081323

What does it mean ?

RTC_E_SIP_INVITEE_PARTY_TIMEOUT  
Invitee connection fails
Value: 107 | 0x006B | 0b0000000001101011

Where does it come from ?

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

Other Errors for FACILITY_RTC_INTERFACE