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Call Scenarios and Applications
Issue 7 March 1998
A-61
Outgoing Call over ISDN Trunk that Results in
an ISDN Progress Message
This section presents the call flow for an outgoing call over an ISDN trunk that
traverses a non-ISDN network(s) before it reaches its destination. Station 4567
initiates an outgoing call to an external destination. Station 4567 has Domain
Control active and uses the Auto Dial capability to initiate the call (see Figure
A-17).
When a call leaves the ISDN network, an ISDN PROGress message is sent from
the PRI network to the ECS and subsequently to the ASAI Adjunct Processor. The
ECS sends the contents of the PROGress message in a Cut-Through Event
Report. Multiple PROGress messages may be sent for a call; each one is mapped
into a Cut-Through Event Report.
For a call that has resulted in a Cut-Through Event Report being generated, the
Alerting Event Report is optional. A Connected and/or Drop Event Report is
always sent as long as the call utilizes the ISDN facilities.
Figure A-17. Call Flow for Outgoing ISDN Call that Traverses a non-ISDN Network
DEFINITY ECS
call_id=60
x4567
non-ISDN
Network
External Endpoint
(ISDN Trunk)