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TAPI_E_REQUESTFAILED
What TAPI_E_REQUESTFAILED means
TAPI_E_REQUESTFAILED The Assisted Telephony request failed, but TAPI did not expose a more specific public reason in this result.
What to check
- Preserve the request ID, target application, parameters, and the first provider or recipient event that reports failure.
- Check application and provider logs for a more specific error that occurred before this HRESULT.
- Determine whether the request reached the recipient or failed during dispatch.
Handling
Do not convert this into an unlimited retry. Correct the lower-level cause when one is available, then submit a new request if the operation is safe to repeat.
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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