Error 0x80040040

Value: -2147221440 | 0x80040040 | 2147745856

What does it mean ?

TAPI_E_TERMINALINUSE  
The operation could not be performed because the terminal is in use.
Value: 64 | 0x0040 | 0b0000000001000000

Where does it come from ?

FACILITY_ITF  
COM/OLE Interface management. FACILITY_ITF is designated for user-defined error codes returned from interface methods
Value: 4 | 0x004 | 0b00000100

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