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TAPI_E_PHONENOTOPEN
What TAPI_E_PHONENOTOPEN means
TAPI_E_PHONENOTOPEN The operation requires an open phone object, but the phone is not currently open for the application.
What to check
- Confirm that the phone was opened successfully and has not since been closed or removed.
- Check the phone privilege/access requested at open time.
- Correlate provider reinitialization or device removal with any invalidated phone handles.
Handling
Open or reopen the intended phone with the required access, then obtain fresh phone-dependent objects before retrying the operation.
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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