Error 0x80040035

Value: -2147221451 | 0x80040035 | 2147745845

What does it mean ?

TAPI_E_DESTNOANSWER  
The called party does not answer.
Value: 53 | 0x0035 | 0b0000000000110101
IO_WARNING_INTERRUPT_STILL_PENDING  
A pending interrupt was detected on device %1 during a timeout operation. A large number of these warnings may indicate that the system is not correctly receiving or processing interrupts from the device.
Value: 53 | 0x0035 | 0b0000000000110101

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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