Error 0x80040025

Value: -2147221467 | 0x80040025 | 2147745829

What does it mean ?

TAPI_E_REQUESTOVERRUN  
The request queue is already full.
Value: 37 | 0x0025 | 0b0000000000100101

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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