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TAPI_E_REQUESTQUEUEFULL
What TAPI_E_REQUESTQUEUEFULL means
TAPI_E_REQUESTQUEUEFULL The call-request queue has reached its capacity, so another request cannot be queued now.
What to check
- Inspect queue depth and the recipients responsible for consuming call requests.
- Check for requests that remain pending because a handler is hung, disconnected, or no longer registered.
- Verify that the application is not duplicating requests after timeouts.
Handling
Wait for capacity or fix the stalled consumer before submitting additional work. A bounded retry may be appropriate only after queue depth has actually decreased.
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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