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TAPI_E_INVALTONE
What TAPI_E_INVALTONE means
TAPI_E_INVALTONE The tone definition is invalid for the current provider, device, or tone-generation operation.
What to check
- Capture frequency, cadence, duration, mode, and the native API receiving the tone description.
- Compare those values with provider capabilities and documented limits.
- Check for zero/negative duration, unsupported frequency combinations, or stale device capabilities.
Handling
Construct a tone within the provider’s supported limits and retry only that tone 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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