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TAPI_E_RESOURCEUNAVAIL
What TAPI_E_RESOURCEUNAVAIL means
TAPI_E_RESOURCEUNAVAIL A resource required by the telephony operation is currently unavailable.
What to check
- Identify the exact provider, line, terminal, media resource, or call feature requested when the result was returned.
- Check capacity, device ownership, service state, and provider events rather than treating it as a generic memory error.
- Compare with another call or device only if that comparison uses the same feature and provider.
Handling
Retry only after the required resource becomes available or after the owning component is repaired. Bound retries so persistent capacity failures remain visible.
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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