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TAPI_E_TERMINALINUSE
The terminal has an existing owner
TAPI_E_TERMINALINUSE (0x80040040) means the terminal object is valid but cannot be assigned because another stream/call currently owns or uses it incompatibly. This is resource ownership, not invalid-terminal identity.
Evidence to capture
Record terminal ID, current owning stream/call, media type, selection mode, provider events, and whether cleanup released terminal references after prior calls.
Focused correction
Release the terminal through the owning lifecycle or choose a different compatible terminal. Avoid forcibly recreating provider state while a live call still owns the terminal.
Technical references
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