function shuts down the application's usage of the line abstraction of API.
The application's usage handle for the line API.
Returns zero if the request is successful or a negative error number if an
error has occurred. Possible return values are:
LINEERR_INVALAPPHANDLE, LINEERR_RESOURCEUNAVAIL, LINEERR_NOMEM,
If this function is called when the application has lines open or calls
active, the call handles are deleted and TAPI automatically performs the equivalent
of a lineClose
on each open line. However, it is recommended that applications explicitly
close all open lines before invoking lineShutdown
. If shutdown is performed while asynchronous requests are outstanding, those
requests will be canceled.
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