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TAPI_E_INVALDEVICECLASS
What TAPI_E_INVALDEVICECLASS means
TAPI_E_INVALDEVICECLASS The device-class identifier is invalid or is not recognized for the requested TAPI device operation.
What to check
- Record the exact device-class string and the API receiving it.
- Enumerate the device classes supported by the selected address or provider.
- Check for spelling, lifetime, or ANSI/Unicode conversion errors in dynamically built class names.
Handling
Pass a device class returned or documented for the active provider. Do not substitute an unrelated class merely to make enumeration succeed.
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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