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Appendix A - Call Control Scenarios
413
Network-initiated call
In the following scenario, the network initiates and disconnects the NCAS call for
dtiB1.
Synchronous Programming
Application Device Driver State Firmware Network
cc_Open( )
D channel line
devices
(dtiB1T24)
-->
NULL
Return with line
device
<--
cc_WaitCall( )
D-channel line
devices
(dtiB1T24)
-->
CCEV_OFFERED
D-channel line
devices (dtiB1T24)
<--
OFFERED CALL_INCOMING
<--
Setup
<--
cc_AnswerCall( )
-->
Call_Connect
-->
CONNECTED Connect
-->
NCAS call connected
cc_SetInfoElem( )
setup user-to-
user information,
D channel line
devices
(dtiB1T24)
-->
cc_SndMsg( )
send user-to-user
signaling
-->
CALL_UUI
-->
UUI
-->
CCEV_USRINFO
<--
CALL_UUI
<--
UUI
<--
cc_GetCallInfo( )
retrieve user-to-
user information
IDLE Release
<--
Release Comp
-->
CCEV_DISCONNECT
<--
CALL_DISC
<--
cc_DropCall( )
-->
CALL_DISCONNECTED
-->