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Appendix A - Call Control Scenarios
397
Network Facility Request or Service
Vari-A-Bill (AT&T Service Only)
Vari-A-Bill is a service option provided only by AT&T at the press time of this
document.
document.
Asynchronous Programming
Application
Device Driver
State
Firmware
Network
CALL_ALERT
-->
-->
Alerting
-->
-->
CALL_CONNECT
-->
-->
Connect
-->
-->
CCEV_CONNECTED
<--
CONNECTED
CALL_CONNECT_ACK
<--
CONN_ACK
<--
cc_SetBilling( )
-->
-->
ISDN_SETBILLING
-->
-->
Request for
billing change
CALL_FACILITY
-->
billing change
CALL_FACILITY
-->
FAC
-->
-->
CCEV_SetBilling
or termination
of
cc_SetBilling( )
or termination
of
cc_SetBilling( )
<--
Response from the
network; a
positive confirm
or a reject for
"a" reason, etc.
ISDN_SETBILLING
network; a
positive confirm
or a reject for
"a" reason, etc.
ISDN_SETBILLING
<--
FAC
<--