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3.9 Comprehensive State Diagrams
This section presents two comprehensive state diagrams of call control functions.
Figure 12
is a state diagram encompassing inbound, outbound, and service interruption control functions.
Figure 13
adds call transfer functionality to
Figure 12
.
The AG Access call state machine is
event-driven
. The state does not change when a call control function is invoked.
To detect if a function is called twice in a row, the library stores the identity of the last call control command issued to the board in the
pendingcommand
field of the call status structure (
ADI_CALL_STATUS
).
The following table shows which functions are allowed in each state.
State
Pending Command
Functions Allowed
IDLE
(none)
Place call
Release
adiPlaceCall
adiReleaseCall
(none)
INCOMING_CALL
(none)
Answer
Reject
adiAnswerCall
,
adiRejectCall
adiAnswerCall
(none)
ANSWERING_CALL
(none)
Answer
Release
adiAnswerCall
,
adiReleaseCall
adiAnswerCall
,
adiReleaseCall
(none)
PLACING_CALL
(none)
Release
adiReleaseCall
(none)
DISCONNECTED
(none)
Release
adiReleaseCall
(none)
CONNECTED
(none)
Release
Release 2nd
Transfer
Place 2nd call
adiReleaseCall
,
adiTransferCall
,
adiPlaceSecondCall
(none)
adiReleaseCall
adiReleaseCall
,
adiReleaseSecondCall
adiReleaseCall
,
adiReleaseSecondCall
REJECTING
(none)
(none)
PLACING_CALL2
(none)
Release
Release 2nd
adiReleaseCall
,
adiReleaseSecondCall
(none)
adiReleaseCall
CONNECTED2
(none)
Release
Release 2nd
adiReleaseCall
,
adiReleaseSecondCall
(none)
adiReleaseCall
Figure 12. Inbound, Outbound, and Service Interruption States
Figure 13. Inbound, Outbound, Service Interruption, and Call Transfer States
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(Page 10 of 12 in this chapter)
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