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Appendix C Application Programmer’s Interface 95
FIGURE C-3 Message Flow for Normal Call Setup and Tear-Down
SetUp
USER
Q.93B SWITCH
Q.93B
USER
SetUpAck
SetUp
Null (0)1 Null(0)
Call Initiated (1)
Call Present (6)
CallProceeding*
CallProceeding*
Outgoing Call
Incoming Call
Proceeding (9)
Connect
Connect
Connect Request
(8)
Active (10) Active (10)
Release
Release_Complete
Release_Complete
Release Request
(11)
Null (0) Null (0)
SetUp
SetUp
Connect
Connect
ConnectAck
ConnectAck
Release
Release
Release_Complete
Release_Complete
ConnectAck
CallProceeding*
Proceeding (3)
1
XX(n): Q.2931 State Name (Q.2931 State Number)
*
Optional