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3. ISDN Technology Overview
21
cc_AcceptCall( )
cc_AnswerCall( )
Null
Offered
cc_MakeCall( )
in progress
Connected
cc_WaitCall( )
cc_MakeCall( )
cc_AnswerCall( )
completion of
cc_makeCall( )
Accepted
LEGEND
State
0
cc_Function( )
CCEV_EVENT
State
1
State
2
Inbound Outbound
CCEV_ALERTING
(Maskable)
Figure 4. Synchronous Call Establishment Process
Table 5 provides an example of a simple inbound call using the synchronous call
establishment process. The items denoted by an asterisk (*) are optional
functions/events or maskable events that may be reported to the application. For
more detailed call scenarios, see Appendix A.