Error 0x80EE0073

Value: -2131885965 | 0x80EE0073 | 2163081331

What does it mean ?

RTC_E_SIP_HOLD_OPERATION_PENDING  
Currently an hold operation is pending
Value: 115 | 0x0073 | 0b0000000001110011

Where does it come from ?

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

Other Errors for FACILITY_RTC_INTERFACE