A Call Without an Owner
What happens to an incoming call if no applications have the line open with
owner privilege? First, TAPI informs all monitoring applications on the line
about the call. If no monitoring application switches to owner privilege to answer
the call, the service provider eventually drops the call.
The following steps describe what normally happens if a line has only
monitoring applications, a call comes in, and no applications answer the call. Assume
that the service provider is not configured to answer new calls by itself.
- The service provider passes the call handle to TAPI.
- TAPI passes monitor handles to the monitor applications.
- TAPI determines that the call is in the offering (not connected) state and lets the call "sit."
- The remote party eventually hangs up, and the call reverts to the idle call state because it was never connected.
- The monitors are notified that the call is idle and deallocate their handles if they have not already done so.
- The last deallocation causes a TSPI_lineCloseCall.
Although the call in this example was never answered, its appearance and
disappearance may have been significant to the applications monitoring the line. On
a network that offers caller ID, a user may want to screen incoming calls,
recording who has called without necessarily answering every call. Monitoring
applications can help accomplish this without ever needing to answer a call.
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