AT&T MERLIN LEGEND Release 3.1 System Planning Manual page 183

System Features
Keep in mind that for 10-digit toll calls, callers must dial 1 before dialing the
area code, even if they don't normally need to dial a prefix to make a toll call.
Figure 4 1 provides a sample of a completed ARS worksheet.
Planning Form Instructions
1. Review Form 2c, System Numbering: Line/Trunk Jacks, for the types of
lines/trunks available.
2. Record the number of exchanges in the local calling area in the blank at
the top of Form 3e, Automatic Route Selection Worksheet. If you are not
sure how many exchanges there are, consult the telephone directory.
3. Enter the number of each of the trunk pools (factory setting is 70 or
890 899) in the Trunk Pool No. column.
Some trunk pools, such as in-state WATS trunk pools, can be used for
both toll and local calls. (Note that with ARS a local call is any call that
doesn't require dialing a 1.)
If you expect people to use a particular trunk pool for both toll and local
calls, enter the number of that trunk pool in the worksheet twice, and note
the reason.
4. For each trunk pool number entered:
a. In the Trunk Type column, record the type of trunk (local, FX, regional
WATS, and so on) that is in the pool.
b. Under the Type of Dial heading, check the appropriate column (Toll or
Local) for the type of call that should be dialed on each trunk pool:
c. Enter the total number of different area codes or exchanges that the
pool should serve in the Number of Area Codes or Exchanges for
which Trunk Pool Is Used column.
If you do not know the exact number of exchanges or area codes,
write a note such as All area codes in the U.S. except the 15 served by the
regional WATS lines/trunks. Keep in mind that you're recording how
many different area codes or exchanges the pool should access, not
the area codes or exchanges themselves. This step helps identify the
preferred trunk pools for toll and local calls. ( Preferred pools are the
trunk pools in which the system places each call unless a different
route has been specified for that particular type of call.)
4–48
Features
Toll. Any call that has a series of digits beginning with a 1,
followed by an exchange or area code.
Local. Any call that is not a toll call. This includes the seven-digit
dialed numbers required in most areas.