Technical information

Small Business Communications Systems
5-50 Issue 7 June 2001
DS1 – T1 and/or PRI.
1. WATTS: Customers may restrict 011 and 809 (the Dominican Republic)
dialing if they have no need to call overseas or the 809 area code. See
Disallow List Information.
2. ISDN – PRI: The way toll restrictions can be bypassed are limited on
lines/trunks.
011 Restrictions (International).
1. Make ARS table for 011.
a. If 011 is not needed, make the FRL on 011 table 4 or greater and
change FRL on extensions which need access to 011 the same.
b. If 011 is needed, make the FRL on 011 table 4 or greater and
change FRL on extensions requiring access to 011 the same.
2. Make disallow list for 011.
a. Make disallow list.
b. Assign all ports not needing access to 011 (including MFM’s and
default locations, etc) to disallow list.
3. See “Toll Fraud Investigation: Disallow List Information, page 5-41” if
specific countries or areas need to be restricted.
Caribbean Islands restrictions (or any other “hot spot” geographic area) See
www.nanpa.com (North American Numbering Plan Administration) or
www.att.com/traveler/tools/codes.html (international country codes) for area code
and geographic break downs.
Ex: 809 = Dominican Republic 441 = Bermuda 473 = Granada
787 = Puerto Rico. 268 = Antigua 345= Caiman Islands
242 = Bahamas 758 = St. Lucia
246 = Barbados 340 = Virgin Islands
1. Make a table for an affected area code (ex: 809, 787, etc.) and make FRL
on extensions requiring access to these area codes, the same.
2. Make disallow list for affected area codes (ex: 011809, 011787, etc.)
Assign ALL extensions not requiring access to affected area code (ex:
011809, 011787, etc.) to disallow list (include MFM’s, unused extensions,
and default extensions etc.)
3. FRL should be set to secure toll fraud through ARS.