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TAPI_E_NOCONFERENCE
What TAPI_E_NOCONFERENCE means
TAPI_E_NOCONFERENCE The operation requires a conference call, but the target call is not currently part of a conference.
What to check
- Record the call state and conference membership immediately before the failing method.
- Verify whether conference creation or consultation-call attachment completed successfully.
- Check whether a participant left and caused the conference object to change.
Handling
Establish or reacquire the conference relationship before invoking conference-only methods; do not assume membership from UI state alone.
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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