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TAPI_E_NOTSUPPORTED
TAPI_E_NOTSUPPORTED: exact failure boundary
0x80040003 corresponds to TAPI_E_NOTSUPPORTED. The platform message is This method is not supported. This result is returned while a TAPI 3 interface method delegated to a telephony service provider. The diagnostic question is whether the address, call, terminal, or provider does not implement the requested capability.
Evidence to capture
- Record this result, 0x80040003, the native method name, process and thread IDs, operation ID, component build, architecture, and elapsed time.
- Capture address type, destination form, media flags, provider capability, call state, privilege, and request or completion identifier.
- Keep IErrorInfo, provider extended status, relevant device/storage events, and the first lower-level failure.
- When handling this result, unsubscribe events, release call and terminal interfaces, cancel only live asynchronous requests, and let terminal call-state events drive final cleanup.
Likely causes to separate
- The service provider omits the optional feature.
- The device technology cannot perform the operation.
- The client assumes uniform support across providers.
Focused diagnostic test
Reproduce the same native call with the same object identity and change one cause candidate at a time. Preserve the first provider or lower-layer result and compare object state before cleanup. A different HRESULT after one controlled change is a new boundary, not proof that the original operation is fully repaired.
Correction
query capability interfaces and use a provider-appropriate fallback instead of retrying unchanged.
Verification
After correction, repeat the operation that returned this result. Verify the intended API operation completes and that any output, ownership transfer or persistent state is valid; do not treat disappearance of the dialog alone as success.
Technical references
- Microsoft: TAPI_E constants
- Microsoft: ITAddress:CreateCall
- Microsoft: ITBasicCallControl
- Microsoft: TAPI 3 reference
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