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TAPI_E_INVALIDDIRECTION
What TAPI_E_INVALIDDIRECTION means
TAPI_E_INVALIDDIRECTION The TERMINAL_DIRECTION value is not valid for the terminal operation.
What to check
- Capture the terminal, stream, media type, and requested direction.
- Compare the direction with the terminal and stream capabilities currently advertised.
- Check that a direction valid for one terminal type was not reused for another.
Handling
Select an input/output direction supported by the exact terminal and stream. Rebuild the binding if media topology has changed.
References
- Microsoft: TAPI_E constants — official Microsoft documentation used to interpret the HRESULT.
- Microsoft: TAPI 3.1 Reference
- Microsoft: Telephony API interfaces
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