AT&T MERLIN LEGEND Communications System PBX System Planning Manual page 148

Features
Planning Form Instructions - Continued
For each trunk pool number entered:
3. Record the type of trunk (local, FX, regional WATS, etc.) in the pool in the
"Trunk Type" column.
4. Write the appropriate letter, T (toll) or L (local), in the "Type of Dial"
column for the type of call that should be dialed on each trunk pool:
T = Toll: Any call that has a series of digits that begins with a 1,
followqed by an exchanged or area code. When placing a toll call using
ARS, callers dial 11 digits (1 + 3 [area code] + 3 [exchange] + 4 [last
four digits of the number]) or 8 digits (1 + 3 [exchange] + 4 [last four
digits og the number]).
Keep in mind that callers must dial 1 before dialing the area code,
even if they don't normally need to dial a toll prefix to make a toll call.
Users who dial eight digits may want to avoid the delay while the
system makes sure all digits are dialed by dialing a # after the eighth
digit. This signals the system that all digits are dialed.
L + Local: Any call that does not fall under the definition of toll. This
includes both 7-digit dialing and 1 + 7-digit dialing still required in
some areas.
5 . 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 don't know the exact number of exchanges or area codes, enter a
note such as "All area codes in the U.S. except the 15 served by the
regional WATS trunks."
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 on which the system places each call
unless a different route has been specified for that particular type of call.)
Under the "Preferred Trunk Pools" heading:
6 . Determine which of the toll tunk pools is used for calls to the greatest
number of different area codes.
space next to "Toll Calls."
In Figure 4-1, the cross-country WATS trunk pool serves the greatest
number of different area codes, every are code in the country except the
two area codes in Colorado.
c a l l s .
7 . Determine which of the local trunk pools is used for calls to the greatest
number of different exchanges.
sopace next to "Local Calls."
In the example, Figure 4-1, the in-state WATS trunk pool serves the
greatest number of different exchanges.
calls to every exchange in area code 303 except the 20 exchanges in the
local calling area. Therefore, it is the preferred trunk pool for local calls
Note: Table 17 and 18 will be explained later.
Keep in mind that you're recording how many
Write the number of that trunk pool in the
Therefore, it is the preferred trunk pool for toll
Write the number of that trunk pool in the
It is the preferred trunk pool for
System Features 4-43