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TAPI_E_INVALCALLPARAMS
TAPI_E_INVALCALLPARAMS: exact failure boundary
0x8004000E corresponds to TAPI_E_INVALCALLPARAMS. The platform message is Invalid LINECALLPARAMS structure. This result is returned while call creation or dialing with LINECALLPARAMS-compatible configuration. The diagnostic question is whether the call parameter structure has an invalid size, offset, flag, range, or embedded data region.
Evidence to capture
- Record this result, 0x8004000E, 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
- DwTotalSize is too small.
- Variable-data offsets extend beyond the buffer.
- Bearer, media, or call flags conflict.
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
zero-initialize the structure, validate every offset and size, and populate only fields supported by the negotiated API version.
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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