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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Features
Page 4-60System Features
4
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 4
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 and
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 .)
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,
network, regional WATS, and so on) that is in the pool.
b. Under the Type of Dial heading, check the appropriate column
(Local, Toll, or Network) for the type of call that should be dialed on
each trunk pool:
■ 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.
■ Network. Any call that will be routed to a non-local switch.
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.
NOTE:
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 are 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.)