Error 0x80040007

Value: -2147221497 | 0x80040007 | 2147745799

What does it mean ?

OLE_E_BLANK  
Uninitialized object
Value: 7 | 0x0007 | 0b0000000000000111
TAPI_E_CALLUNAVAIL  
No call appearance available.
Value: 7 | 0x0007 | 0b0000000000000111

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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Other Errors for FACILITY_ITF