AT&T MERLIN LEGEND Release 4.0 Feature Reference page 68

Feature Reference
Star Codes and Automatic Route Selection
In some instances, after dialing a star code (a star digit followed by a two or
three digit number) the central office provides a second dial tone as a prompt
for the dialer to enter more digits. In most cases this second dial tone is
immediate. However, in cases when the second dial tone is delayed, calls can
be misrouted or dishonest users might be able to circumvent communications
system dialing restrictions.
In Release 3.1 and later, Automatic Route Selection processes star codes at the
beginning of a dialed number and sends the digits to the central office, before
any other digit analysis occurs. Any programmed prepended digits are added
after the star code, but before the rest of the telephone number.
Automatic Route Selection is unable to route calls that consist only of a star
code with no additional digits (such as 44 for Voice Activated Dialing) because
the user has not dialed any digits which the system can use to choose a route.
Dialing calls with star codes using ARS can cause dropped/misrouted calls
when prepended digits are used to select facilities other than regular central
office lines/trunks. It is recommended that ARS calls containing star codes not
be used in configurations where the MERLIN LEGEND Communications System
is behind another switch or is used to select non-standard facilities.
For more information on using Allowed and Disallowed Lists to restrict star
codes see the Allowed/Disallowed feature.
ARS Restrictions for VMI ports
In Release 3.1 and later, 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.
!
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.
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 thorough system programming.
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Automatic Route Selection