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TAPI_E_INVALCALLPARAMS
TAPI_E_INVALCALLPARAMS: diagnose the owning boundary
TAPI_E_INVALCALLPARAMS (0x8004000E) is documented as Invalid LINECALLPARAMS structure. Treat that wording as the specific TAPI call-parameter validation boundary; it is more useful than a generic “component failed” label.
Evidence that matters
Preserve LINECALLPARAMS size, offsets, media/bearer modes, destination data and the line device. Validate structure ranges before placing the call.
Interpretation and verification
Keep the affected object and caller identity stable while changing only the rejected prerequisite. The correction is proven when the original operation crosses this boundary with the intended state or output. If a different HRESULT appears afterward, preserve it as a separate later-stage result rather than folding it back into TAPI_E_INVALCALLPARAMS.
Technical references
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