Lucent Technologies MERLIN LEGEND Release 5.0 Feature Reference page 101

MERLIN LEGEND Communications System Release 5.0
Feature Reference 555-650-110
Features
Automatic Route Selection
in configurations where the MERLIN LEGEND Communications System is behind
another switch or is used to select nonstandard facilities.
ARS Restrictions for VMI Ports
In Release 3.1 and later systems, any port programmed as a VMI port is
programmed with a Facility Restriction Level (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 an 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.
!
SECURITYlALERT:
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
A user hears inside dial tone on an SA button and dials the ARS access code
(usually a
toll-restricted and the number dialed is not on the Allowed List, or if the number
dialed is on the Disallowed List, the user receives 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.
Table Selection
411, 611, 811, 911, or 10xx (Equal Access Code)
If the caller dials one of these N11 or equal access numbers, the call is routed
over the main pool, using the factory-set Special Numbers (N11) Table.
Area Code Tables Local/Disallowed
Dial 0 Table
) to connect to ARS, then dials a call. If the extension is restricted or
9
Exchange Tables
Special No. (N11)
Table
2
2
2
6-Digit Tables 1+7 Tables
Default Toll Table Default Local
Table
Issue 1
June 1997
Page 69
2