Instruction manual

Changing Disallowed Lists
■
Only two- or three-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, although 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
Managing the System
6–65