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TAPI_E_SERVICE_NOT_RUNNING
The TAPI service layer is unavailable
TAPI_E_SERVICE_NOT_RUNNING (0x8004005A) means the operation cannot proceed because the owning telephony service is stopped or not ready. Provider object state and dial parameters have not necessarily been evaluated.
Evidence to capture
Record Telephony service state, startup/dependency errors, TAPI initialization result, service control events, and whether the system is shutting down or starting.
Focused correction
Start/restore the supported Telephony service and reinitialize TAPI, then re-enumerate objects. Do not reuse stale line/call handles obtained before service recovery.
Technical references
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