AT&T MERLIN LEGEND Communications System PBX System Planning Manual page 155

Features
4-50 System Features
The factory-set value for digit absorption is O, which means the system places a
call using all the digits that the caller dialed. The values 1–11 tell the system not
to dial a certain number of digits, starting with the first digit dialed by the caller.
If you want the system to absorb a leading 1, assign a value of 1. If you want the
system to absorb a leading 1 and the area code, assign a value of 4, and so
forth.
For example, a branch office in Albuquerque, New Mexico, has a tie-trunk pool
to company headquarters in San Diego, California. The complete telephone
number at headquarters is an 11-digit number, 1 + the area code + the
exchange + the 4-digit number. People in the branch office dial all 11 digits, but
the system dials only the last 4 digits to place these calls. This happens
because an absorb value of 7 was assigned with the tie-trunk pool in the ARS
table that routes calls to this area code and exchange. The absorption value of 7
in the table tells the system to absorb the 1, the area code, and the exchange,
so the call can be placed on one of the tie trunks.
Planning Form Instructions - Continued
In the "Subpattern" sections on Form 9b and Form 9c:
4. To direct calls differently according to time of day, write a time for each
subpattern in the "Time of Day" space (for example, 8 a.m.).
5. To complete the "Pool" column for each subpattern, write the number of
the preferred trunk pool next to the number 1. This is the pool on which
calls to the area codes or exchanges listed in the "Area Code/Exchanges"
section of this form should be placed.
If you want to designate a backup pool in case all the trunks in the first-
choice pool are busy, write the number of the backup trunk pool next to
the number 2, and so on.
6. To complete the "FRL" column, enter a value of 0-6, which determines the
Facility Restriction Level for users. The least restrictive is 0, and 6 is the
most restrictive. Assign a value of 0 if you want all users to access the
route and 1-6 to restrict calling for the route to specific users only.
Subpattern Example: The form for a typical Area Code Table, illustrated in
Figure 4-4, shows a table to route calls to the 13 area codes served by the
northeastern (band 1) WATS lines beginning at 8 a.m. with no restrictions. The
number of the northeastern WATS pool, 891, is on the first line in the "Subpattern
A" section. The time, 8:00 a.m., is in the "Time of Day" space, and a FRL of 0
indicates no restrictions, The 11 p.m. in the "Time of Day" space for Subpattern
B and Pool 70 in the 'Pool' column indicates that calls to these area codes are to
be routed over the main pool after 11 p.m.