MERLIN LEGEND Communications System Release 6.1
Feature Reference
555-661-110
Issue 1
August 1998
Features
Page 42Allowed/Disallowed Lists
Tandem Switching In Release 6.0 and later systems (Hybrid/PBX mode only), when a
system’s lines/trunks are used by callers on remote systems to make
outside and intersystem calls, the system manager helps to prevent toll
fraud by assigning a Disallowed List to the Remote Access default COR
for tie and/or non-tie trunks. (The factory setting of Disallowed List 7 is
recommended.) When a call is routed from one system to another in a
network, the receiving system treats the call as a remote access call
without a barrier code and consults these lists in order to permit or forbid
the call. A Disallowed List can be used in this way to restrict calls that
originate from other systems in the network. Do not assign Allowed Lists
to the Remote Access default COR.
Toll Type When lines/trunks with different toll types are connected to the system (for
example, basic lines/trunks and PRI facilities), a toll prefix (


or ) may be
required for toll calls on some lines/trunks but not on others. In this case,
two Disallowed List entries are required to restrict users from dialing
specific area codes and/or telephone numbers. For example, to restrict
users from dialing calls in the 505 area code on both toll types, one entry
must be
 and the other entry must be . When the Disallowed List
is assigned to an extension, the
 entry restricts users from making
calls to the 505 area code on lines/trunks that do not require a toll prefix,
and the
 entry restricts users from making calls (including local calls)
to the 505 area code on lines/trunks that
do
require a toll prefix. The same
rules apply to Allowed Lists.
Allowed and Disallowed lists are not used to
restrict UDP calls.
UDP Features For Release 6.0 and later systems (Hybrid/PBX mode only), Allowed and
Disallowed Lists assigned to extensions are not used to restrict UDP
calls.
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