Error 0x80EE0074

Value: -2131885964 | 0x80EE0074 | 2163081332

What does it mean ?

RTC_E_SIP_UNHOLD_OPERATION_PENDING  
Currently an unhold operation is pending
Value: 116 | 0x0074 | 0b0000000001110100

Where does it come from ?

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

Other Errors for FACILITY_RTC_INTERFACE