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TAPI_E_REQUESTOVERRUN
What TAPI_E_REQUESTOVERRUN means
TAPI_E_REQUESTOVERRUN The Assisted Telephony request mechanism is already saturated and cannot accept the new request.
What to check
- Measure the number and age of pending requests and whether recipients are draining them.
- Check for a producer loop that submits faster than the registered handler can process.
- Correlate the first overrun with handler stalls, process suspension, or lost completion events.
Handling
Apply backpressure and bound request production. Once the queue is draining normally, submit only work that is still relevant rather than replaying the entire backlog.
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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