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MERLIN LEGEND Communications System Release 5.0
System Manager’s Guide
555-650-118
Issue 1
June 1997
Features and Applications
Page 4-43Features
4
In Release 3.1 and later systems in Hybrid/PBX mode, remote access users are
automatically restricted from making outside calls using the system. See ‘‘
Facility
Restriction Levels (FRLs)’’ on page 4-44 for more information.
Allowed/Disallowed Lists 4
Apply to: Extensions and remote access barrier codes
Use Allowed Lists to permit restricted users to make some calls. (Tagged System
Speed Dial codes or their corresponding marked Directory listings can also be
used to make certain calls.) Use Disallowed Lists to provide some protection from
toll abuse when no other restrictions are applied. Allowed/Disallowed Lists can be
used with any other calling restrictions. This feature provides flexibility by allowing
users whose phones are restricted to call specific numbers related to their
business activities, as well as emergency numbers.
Beginning with Release 3.1, star codes can be included in Allowed and
Disallowed Lists (in Releases 3.0 and earlier, the system treats star codes no
differently from other dialed digits, and you cannot include a star code in an
Allowed/Disallowed List; this can affect calling restrictions and ARS routing).
Furthermore, they are ignored by the Automatic Route Selection feature when
routing calls. Star codes, typically dialed before an outgoing call, provide special
services from the CO. For example, in many areas a telephone user can dial
*67
before a telephone number to disable central office-supplied caller identification at
the receiving party’s telephone. To allow or disallow use of this star code
preceding a call, you include
*67
in an Allowed or Disallowed List. For each star
code, a separate list entry is required. For more information about star codes in
Allowed/Disallowed Lists, see Chapter 6, ‘‘
Managing the System’’.
Beginning with Release 3.1, a default Disallowed List (number 7) is provided with
the system. This Disallowed List is automatically assigned to both generic and
integrated VMI ports used by voice messaging systems. It includes the following
entries, which are often used for toll fraud:
■ 0, to prevent international calls
■ 10, to prevent access to long-distance service providers
■ 1809, to prevent unauthorized international calls routed through the
Dominican Republic
■ 1700, to prevent unauthorized toll calls with a “700” area code
■ 1900, to prevent unauthorized toll calls with a “900” area code
■ 976, to prevent local toll calls to numbers with “976” local access codes
■ 1www976, where “w” stands for a wildcard entry, to prevent long-distance
calls to numbers with “976” local access codes
■ 11, to prevent the use of star codes at single-line telephones
■ *, to prevent the use of star codes at multiline telephones