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TAPI_E_NOTREGISTERED
What TAPI_E_NOTREGISTERED means
TAPI_E_NOTREGISTERED The application attempted an Assisted Telephony operation for which it is not registered as a request handler.
What to check
- Check the application registration performed at startup or installation.
- Verify that registration matches the request mode and current user context.
- Confirm that cleanup from a previous run did not unregister the handler while the process still assumes registration.
Handling
Establish the required registration before accepting or manipulating requests, and remove stale assumptions about registration across process restarts.
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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