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TAPI_E_INVALRATE
What TAPI_E_INVALRATE means
TAPI_E_INVALRATE The requested transmission rate is unsupported or invalid for the selected provider, device, or media mode.
What to check
- Record the requested rate together with media type and device/line identity.
- Compare it with the rates advertised by the provider for the current mode.
- Check unit conversion and integer overflow if the value is computed by a wrapper.
Handling
Choose a supported rate or renegotiate the media/device mode. Validate computed rates before passing them into TAPI.
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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