Error 0x80EE000E

Value: -2131886066 | 0x80EE000E | 2163081230

What does it mean ?

RTC_E_SIP_INVITE_TRANSACTION_PENDING  
Currently processing another INVITE transaction
Value: 14 | 0x000E | 0b0000000000001110

Where does it come from ?

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

Other Errors for FACILITY_RTC_INTERFACE