Lucent Technologies MERLIN LEGEND Release 7.0 Feature Reference page 143

MERLIN LEGEND Communications System Release 7.0
Feature Reference 555-670-110
Features
Automatic Route Selection
either behind another switch or used to select non-standard facilities. For Release
6.0 or later systems (Hybrid/PBX mode only), star codes are not sent over the
network.
ARS Restrictions for VMI Ports
In Release 3.1 and later systems, any port programmed as a VMI port is
programmed with a FRL of 0. If the system manager wants to allow access to the
voice messaging system Outcalling feature, the FRL applies to Outcalling calls.
If the system manager changes a VMI port to a non-VMI port, the FRL is not
reassigned on the port. If the default FRL should be changed, the system
manager must change it through system programming.
!
SECURITY ALERT:
Any changes to the FRL and other restrictions of these ports must be
considered carefully in order to minimize the potential for toll fraud.
How ARS Works
You hear an inside dial tone on an SA button, and you dial the ARS access code
(usually a 9) to connect to ARS, then you dial a call. If the extension is restricted
or toll-restricted and the number dialed is not on the Allowed List, or if the number
dialed is on the Disallowed List, you receive a system error tone. Otherwise, ARS
compares the number dialed with information in the tables. All tables are available
for use at first. Tables are then eliminated from possible use on the call, one by
one, until the best table is selected.
Once the table is selected, ARS chooses the appropriate subpattern and checks
restrictions, eliminating from consideration any routes with restriction levels higher
than the extension's. Any remaining eligible routes are scanned from the
beginning of the list. The first eligible route that is not busy is selected.
NOTE:
In Release 6.0 and later systems, equal access calls (Interexchange or IXC
calls), Dial 0 calls, and N11 calls from systems that are not connected to the
public switched telephone network require special planning. See
Switching'' on page 699 for details.
Issue 1
April 1999
83
''Tandem