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TAPI_E_CALLUNAVAIL
TAPI_E_CALLUNAVAIL: diagnose the owning boundary
TAPI_E_CALLUNAVAIL (0x80040007) is documented as No call appearance available. Treat that wording as the specific TAPI call availability/state boundary; it is more useful than a generic “component failed” label.
Evidence that matters
Record line/call state, address, privilege, current active calls and provider result. Retry only after the call or line reaches a state that permits the requested operation.
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_CALLUNAVAIL.
Technical references
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