Technical information

Small Business Communications Systems
5-32 Issue 7 June 2001
If you program the route in the 6-Digit table to absorb N digits, the actual number
of digits absorbed will be as follows:
 If the user dials an 11-digit number (including the leading “1”), ARS absorbs
N digits. For example, you program the 6-digit table to absorb 4 digits, and
the user dials 1-732-555-1234. In this example, 4 digits are absorbed, and
555-1234 is the number that ARS sends as the dialed number to the
central office.
 If the user dials a 10-digit number (not including the leading “1”), ARS
absorbs N-1 digits. For example, you program the 6-digit table to absorb 4
digits, and the user dials 732-555-1234. In this example, 3 digits are
absorbed, and 555-1234 is the number that ARS sends as the dialed
number to the central office.
To configure ARS to correctly route 10- and 11-digits numbers, do the following:
 Determine the area codes and exchanges that allow 10-digit dialing and for
which you want ARS routing based on 10-digit dialing.
 Determine the routing you want for each area code and exchange in the
list.
 Add the area codes and exchanges to the ARS tables:
1. If all the exchanges in an area code should be routed on the same
trunk pools, add the area code to an exchange table and to an area
code table.
2. If you want only certain exchanges in an area code routed based on
10-digit dialing, add the area code and the exchanges to a 6-digit
table.
When you configure a system for 10-digit dialing and a user places an outside call
preceded by the ARS dial-out code, the system searches the 6-digit tables for
area code and exchange code dialed by the user. If a match is not found, the
system does one of the following:
 If the user dialed a leading “1,” the system searches the area code tables. If
a match is not found in the area code tables, the call is routed by the
Default Toll table.
 If the user did not dial a leading “1,” the system searches the exchange
tables. If a match is not found in the exchange tables, the call is routed by
the Default Local table.
****SECURITY ALERT****
A user restricted from dialing a toll number (11-digit) may be able to dial that same
number by using 10-digit dialing when a “leading 1” is not required. Correct this
situation by programming the ARS Facility Restriction Level (FRL), the extension
restriction level, and/or the Allowed/Disallowed Lists. In addition, because
non-matching 10-digit calls go to the Local Table with an FRL of 2, users with an
FRL of 2 can make 10-digit long distance calls.