Nortel DMS-250 - Page 92

5-20 Call control procedures
297-2521-106 Standard 23.01 March 2001
Figure 5-11
Trunk release sequence of events
EVS switch EVS ARU
PRI
Incoming trunk
Outgoing trunk
Incoming trunk
Outgoing trunk
EVS switch EVS ARU
PRI
Incoming trunk
Outgoing trunk
EVS switch EVS ARU
1.
call prior to
Transferred
releasing
PRI trunks.
2.
call prior to
Bridged
releasing
PRI trunks.
3.
bridged after
Transferred/
releasing
PRI trunks.
Figure 5-12 illustrates the trunk release messaging sequence and shows how
calls are routed from the EVS switch into the EVS ARU over PRI trunks,
then transferred to a new destination through the EVS switch.