HRESULT 0x8004003F (TAPI_E_NOTERMINALSELECTED): meaning

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The operation could not be performed because it requires terminals to be selected.

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TAPI_E_MAXSTREAMS	TAPI_E_TERMINALINUSE

TAPI_E_NOTERMINALSELECTED

No terminal is selected for the operation

TAPI_E_NOTERMINALSELECTED (0x8004003F) means the current call/stream lacks the terminal object required by the requested media action. It is not the same as a selected terminal being busy or unsupported.

Evidence to capture

Record call, stream/media type, terminal collection, selected terminal ID, provider, and the method that requires it. Confirm selection was not lost after stream recreation.

Focused correction

Select a terminal compatible with the stream/media type before issuing the operation. If a selected terminal is already owned elsewhere, diagnose the terminal-in-use result separately.

Technical references

Microsoft: TAPI_E constants.
Microsoft: ITStream::SelectTerminal.
Microsoft: TAPI 3.1 Reference.
Microsoft: Telephony API interfaces.

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