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Tracking Asynchronous Requests
The function lineMakeCall is one of many functions that operate asynchronously. If an application
manages only one line, it can use one state record, a struct containing all the information needed to track one outstanding
asynchronous request. State records contain information such as the Request ID, the
type of request, and pointers to allocated data that may need to be freed
later.
But some applications have to manage more than one line for example, to manage more than one outgoing call at the same time. To do so,
they need to track the different asynchronous requests possible on each of
those lines, and must therefore create an array of state records, one for each of
the outstanding asynchronous operations (such as multiple invocations of lineMakeCall).
When a reply arrives that shows an asynchronous function has completed, the
application matches the incoming Request ID with a Request ID in the array, and
does whatever that specific call needs at that point. You can design one
function to handle the reply that indicates completion of the outstanding asynchronous lineMakeCall request. The success or failure of the asynchronous request is recorded in
the requestResult field of the state struct.
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