Lucent Technologies MERLIN LEGEND Release 6.1 System Manager's Manual page 181

MERLIN LEGEND Communications System Release 6.1
System Manager's Guide 555-661-118
4 Features and Applications
Features
Pool Dial-Out Code Restriction (Hybrid/PBX mode only). Restrict specific
pools. This can be used to reserve certain pools for specific purposes, for
example, for data communications.
Facility Restriction Levels (Hybrid/PBX mode only). Automatic Route
Selection (ARS) allows Facility Restriction Levels (FRLs) to be applied to
both routes for pools of outside trunks and extensions for the most reliable
control of toll calling.
Remote Access. Remote access callers are required to enter barrier
codes in order to reach the system; Disallowed Lists and FRLs can also be
assigned with each barrier code.
Networking Routes (Release 6.0 and later systems, Hybrid/PBX mode
only). Additional FRLs apply to network routes. See the Network Reference
for details.
In Release 3.1 and later systems, a system programming feature allows you to
help guard against toll fraud when star codes are dialed under certain
circumstances. Star codes, typically dialed before an outgoing call, provide
special services from the CO. For example, in many areas a telephone user can
dial before a telephone number to disable the delivery of central office-
supplied caller identification. To allow or disallow star codes preceding a call, see
"Revising Allowed Lists" on page 6–68
6–71. Star code calling is not supported for calls routed across a private network
(Release 6.0 and later systems, Hybrid/PBX mode only).
Some central offices supply a second dial tone following the dialed star ( ) code,
to signal customers that they must dial additional digits. If this second dial tone is
not immediate, a hacker can enter digits that are not detected by the CO but are
detected by the system's calling restrictions. If your business uses central office
star codes and the CO issues a second dial tone after a pause, see System
Programming for information about including a timed delay that causes the
system to prevent the call when digits are entered during the pause.
In Behind Switch mode, calling restrictions must be supplied by the host system,
not by the MERLIN LEGEND Communications System.
In Release 3.1 and later systems, the system provides certain default calling
restrictions that make it easier for system managers to guard against toll fraud.
These are described below with the specific features they affect.
This section describes each type of calling restriction. Some of these features are
combined with security measures to prevent system abuse by remote access
users or hackers. In addition, users can be assigned authorization codes, which
they can enter when they are away from their extensions. When a person enters
an authorization code while visiting another system extension, the calling
restrictions assigned to his or her own extension are applied to the call. For more
information, see "Authorization Codes" on page
or "Revising Disallowed Lists" on page
4–50.
Issue 1
August 1998
Page 4-44