What does HRESULT 0x8004003B (TAPI_E_INVALIDTERMINAL) mean?

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Constant name:

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Description:

The Terminal passed in was invalid for this operation.

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TAPI_E_INVALIDDIRECTION	TAPI_E_INVALIDTERMINALCLASS

TAPI_E_INVALIDTERMINAL

The supplied terminal is not valid in this context

TAPI_E_INVALIDTERMINAL (0x8004003B) means the terminal handle/object cannot be used by the method, because it is stale, foreign to the address/stream, or otherwise invalid. This differs from having no terminal selected.

Evidence to capture

Record terminal ID/object, address, stream/media type, provider, enumeration generation, and whether the terminal was released or recreated.

Focused correction

Re-enumerate terminals from the current provider and select/use the compatible live object. Avoid carrying terminal objects across TAPI reinitialization.

Technical references

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

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