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TAPI_E_REQUESTCANCELLED
What TAPI_E_REQUESTCANCELLED means
TAPI_E_REQUESTCANCELLED The Assisted Telephony request was cancelled before it reached normal completion.
What to check
- Identify who issued the cancellation and the request ID affected by it.
- Distinguish explicit user cancellation from provider shutdown, recipient teardown, or application cleanup.
- Check whether any call or external action had already started before cancellation was observed.
Handling
Treat cancellation as a terminal outcome for that request. Start a new request only when the caller still wants the action and prior side effects have been reconciled.
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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