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3. ISDN Technology Overview
23
Table 6. Outbound Call Set-up (Synchronous Example)
Function/Event Action/Description
cc_MakeCall( )
Requests a connection using a specified line device;
a CRN is assigned and returned immediately.
*CCEV_ALERTING Remote end was reached but a connection has not
been established
none
When the cc_MakeCall( ) function successfully
completes, the call is in the Connected state.
NOTES: 1.
* = Maskable events
2. There are no termination events in synchronous mode.
3.3.3. Asynchronous Call Termination
Figure 5 illustrates the call states associated with call termination or call teardown
in the asynchronous mode initiated by either call disconnection or failure. A call
can be terminated by the application or by the detection of call disconnect from
the network. Either of these terminations can occur at any point in the process of
setting up a call and during any call state. See Table 2 for descriptions of the call
states.