AT&T MERLIN LEGEND Release 4.0 Feature Reference page 558

Feature Reference
Feature Interactions
Automatic Route
Selection
Disallowed Lists
558
Toll Type
In certain areas, the local telephone company requires dialing the prefix
1 for certain exchanges. In these cases, the exchanges can be
assigned to a 1 + 7 ARS table, and the 1 + 7 Dial setting must be set to
"within area code." This dialing requirement is not related to toll type.
When trunks with different toll types are connected to the system (for
example, basic trunks and PRI facilities), a toll prefix (0 or 1) may be
required for toll calls on some trunks but not on other trunks. 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
Disallowed List is assigned to an extension, the
 
from making calls to the 505 area code on trunks that do not require a
toll prefix and the
local calls) to the 505 area code on trunks that do require a toll prefix.
and the other entry must be
entry restricts users from making calls (including
 
 
. When the
entry restricts users