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MERLIN LEGEND Communications System Release 5.0
System Manager’s Guide
555-650-118
Issue 1
June 1997
Managing the System
Page 6-73Revising Disallowed Lists
6
routing calls. Star codes are provided by the central office (CO) to allow the use of
special features (for example, in many areas *70 turns off a call-waiting feature
provided by the central office). In Release 3.0 and earlier systems, the star code
digits were processed as dialed digits by ARS, Allowed Lists, Disallowed Lists,
and calling restrictions. Therefore, the actual called party number was not
properly processed when a star code was entered.
Release 3.1 and later systems permit system managers to include star codes in
Allowed and Disallowed Lists. If a star code is allowed, the digits following the star
code are checked normally by Allowed/Disallowed Lists, calling restrictions, and
ARS.
The MERLIN LEGEND Communications System Release 3.1 and later observes
these Bellcore standards for star codes:
■ Only 2- or 3-digit star codes are recognized. Two-digit star codes must
begin with 1, 4, 5, 6, 7, 8 or 9. Three-digit star codes must begin with a 2 or
a 3.
■ The star code or codes must come at the beginning of the string of digits
dialed, not at the end or in the middle. Multiple leading star codes are
allowed for dialing, but not in Allowed/Disallowed Lists. For example,
*67*705551212
is recognized correctly, but in
5551212*67*705553131
the
stars are ignored.
■ To prevent rotary phone users from using all star codes, include a separate
Disallowed List entry,
11
. To disallow specific codes, create separate
entries where
11
is substituted for the *, for example,
1167
.
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 rotary telephones
■ *, to prevent the use of star codes at multiline telephones