MERLIN LEGEND Communications System Release 6.1
Feature Reference
555-661-110
Issue 1
August 1998
Features
Page 38Allowed/Disallowed Lists
Star Codes and Allowed/Disallowed Lists 0
In some instances, after a person dials a
star code
(a star digit followed by a 2- or
3-digit number), the central office provides a second dial tone as a prompt for the
dialer to enter more digits. Generally, this second dial tone is immediate. However,
in cases when the second dial tone is delayed, calls can be misrouted or
dishonest users may be able to circumvent communications system dialing
restrictions.
In Release 3.1 and later systems, the system manager can enter the star digit (*)
in Allowed List and Disallowed List entries. The communications system can also
be programmed with a delay period (see “Second Dial Tone Timer” on page 605
),
during which no dialing is allowed while the central office dial tone returns. If
dialing is attempted, the call is treated as though it had violated calling restrictions
and is not completed.
The star codes that the system recognizes are as follows:
■ 2-digit codes: *(00–19, 40–99)
■ 3-digit codes: *(200–399)
Restrictions are reset after leading star codes. This means that any star codes
that are not included in an Allowed or Disallowed List are not considered. The
digits that follow the star code are then compared again to the lists. If a caller dials
, the Allowed/Disallowed List feature acts as though
were dialed. In
this case, star codes do not need to be placed in an Allowed or Disallowed List to
restrict calls to specific exchanges or area codes.
The programmed delay is also activated when the rotary telephone equivalent of a
star code is dialed (for example,
). Multiple leading star codes (such as
) are also handled by the system because the dialed number is checked
against Allowed and Disallowed Lists after each star code is detected.
Following are examples of how to set table entries to achieve specific results:
■ Disallow calls preceded by , but allow all other calls: Enter as a
Disallowed List entry.
■ Disallow calls preceded by all star codes, but allow all other calls: Enter
as a Disallowed List entry.
■ Disallow calls preceded by
or , but allow all other calls: Enter
as a Disallowed List entry, and enter
as a separate entry.
■ Disallow calls preceded by , calls to 900 numbers and 411, but allow all
other calls: Enter
, , and
as separate Disallowed List entries.
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