Appendix A - Call Control Scenarios
413
Network-initiated callIn the following scenario, the network initiates and disconnects the NCAS call fordtiB1.
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
-->