Because MERLIN MAGIX systems of Release 1.5 or later can route either a 10-digit (without the leading "1") or an 11-digit (with the leading "1") dialed call based on both the area code and the exchange code, the way tables are selected is different from the way they are selected in Release 1.0.

If the caller dials one of these N11 or equal access (Interexchange or IXC) numbers, the call is routed over the main pool, using the factory-set Special Numbers (N11) Table.

10- and 11-Digit Dialing

Some central offices allow users to dial a 10-digit telephone number (area code and telephone number without the leading "1") to reach a telephone number that requires an area code. In Release 1.5 and later systems, the MERLIN MAGIX system can route either a 10-digit (without the leading "1") or an 11-digit (with the leading "1") dialed call based on both the area code and the exchange code. This has been accomplished by modifying ARS to include a search of 6-Digit tables whether or not the user dials a leading "1."

The ARS Absorb Digit parameter (the number of user-dialed digits that ARS absorbs, that is, does not dial out) for each route has been enhanced to accommodate 10-digit dialing.

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:
  
  

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.
  
  

The figures below show the search algorithms for systems of Release 1.5 or later when a leading "1" is dialed and when it is not dialed.

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 Default Local Table with an FRL of 2, users with an FRL of 2 can make 10-digit long distance calls.

If the caller dials one of these N11 or equal access (Interexchange or IXC) numbers, the call is routed over the main pool, using the factory-set Special Numbers (N11) Table.

All but the Local Exchange, Default Local, and Dial 0 Tables are eliminated.

ARS eliminates the Default Local, Dial 0, Special Number, and Local Exchange Tables and proceeds as described below.

If only a "1" followed by seven digits have been dialed and there is one 1+7 Table that matches, it is chosen. If more than one table matches, the lowest-numbered table is chosen. If there are no 1+7 Tables that match, ARS picks the Default Toll Table.

If more than seven digits have been dialed after the 1, the 1+7 Tables are eliminated. The next three digits following the 1 are compared to the 3-digit area codes in the Area Code Tables and the first three digits of the 6-Digit Tables; any unmatching tables are eliminated. If there are no matches, the Default Toll Table is selected.

If there are matching tables, the next three digits are compared to the second through ninety-ninth entry in the remaining 6-Digit Tables. If there is only one match, that 6-Digit Table is used. If there is more than one match, the lowest 6-Digit Table is used. If there are no matches and there are no area code tables left, the Default Toll Table is selected. If there are no matches and there are Area Code Tables that have not been eliminated, one of the Area Code Tables is chosen. If there is one table left, it is used. If there is more than one table, the lowest one is used.