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TAPI_E_NOTSTOPPED
What TAPI_E_NOTSTOPPED means
TAPI_E_NOTSTOPPED The requested stream operation requires a stopped stream, but the stream is still running or transitioning.
What to check
- Record the current stream state and the most recent start/stop events.
- Wait for the provider’s stop completion rather than assuming a stop call is synchronous.
- Check whether another component restarted the stream after the application requested stop.
Handling
Stop the stream and wait until the provider reports the stopped state before performing the operation that requires it.
References
- Microsoft: TAPI_E constants — official Microsoft documentation used to interpret the HRESULT.
- Microsoft: TAPI 3.1 Reference
- Microsoft: Telephony API interfaces
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