What does HRESULT 0x80040016 (TAPI_E_INVALDIGITS) mean?

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TAPI_E_INVALDIGITS means the requested digit string is invalid for the active TAPI provider, call, or media-control operation.

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TAPI_E_INVALDIALPARAMS	TAPI_E_INVALGROUPID

TAPI_E_INVALDIGITS

TAPI_E_INVALDIGITS The digit string or digit operation is not accepted by the active provider, call state, or media-control path.

Record the exact digit string, digit mode, call state, and API that rejected it.
Check provider capabilities for supported digit types, separators, and maximum lengths.
If the digits came from user input or a dial-plan rewrite, compare the post-normalization value with a known-good request.

Correct the digit format or use a digit mode supported by the provider. Retry only after the rejected value or the call state has changed.