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PERCEPTIONea,
LCWTR PROGRAMMING GUIDE
MARCH 1991
to restrict calls to the local central office operator,
international calls, and/or long distance directory
assistance.
2.13 Eight different TR classes (CLS 0 w 7) can be
programmed in the previously-described manner.
+I+ Also, CLS 8 restricts all I+ and a + calls.
2.14 All stations programmed for TOL = NONE will
have no restrictions. The TOL parameter (TR class
number) is located in the
DEKT, DSlT,
and
DTGP
(TIECCSA Trunks)
Programs.
2.15
Before a call via Least Cost Routing or Direct
Trunk Access (DTA) is completed, the
DTOL
Program
will decide whether or not the number
being dialed is allowed. If not allowed, the originating
station will receive overflow tone. If allowed, the
call will be processed further.
2.16 All of the above logic and the remainder of the
TOL parameter are described, and can be followed
step-by-step, in the Detailed Logic Flowchart.
Example:
Fpllow a call through the Logic Flowchati
according to what is programmed in Example
#2.
3. NUMBERING
PLAN (NORTH AMERICA)
3.00 Description
3.01
All telephone systems in the USA and Can-
ada use the North American Numbering Plan. All
PERCEPTION,&,,
LCR/TR features are based
on this plan.
3.02 The routing codes for Direct Distant Dialing
(DDD) within the North American Numbering Plan
consist of two basic parts:
1) A 3-digit area code or Numbering Plan Area
(NPA) code.
2) A 7-digit telephone number made up 0f.a 3-digit
central office (CO) code and a 4-digit station
number.
NOTE:
When used together, these ten digits com-
prise the network "'address" or destination
code for each telephone.
l
The first digit of the area code must be a number
between 2 and 9. The second digit must be a 1
or 0. The third digit may be any number between
0 and 9.
l
The first two digits in the CO code must be any
numbers between 2 and 9, except when inter-
changeable codes are used (then the second
digit can be any number between 0 and 9). The
third digit of the CO code on all four subscriber
numbers may be any number between 0 w 9
TABLE A
NORTH AMERICAN NUMBERING PLAN
Area Code
Off ice Code
NO/l X
NNX
X
= any number from 0 - 9
N
= any number from 2 - 9
Subscriber
No.
xxxx
O/l = number 0 or 1
I
(Table A).
3.03 The following are exceptions to the rule:
1)
2)
3)
Service Code (Nli): This is used for various
special local services and, when programmed
properly, is recognized only as a service code.
In this case, the system will act immediately
after this 3-digit number is completed.
Interchangeable Codes (ICC): In some areas,
the second digit of the office code is allowed to
be any number from 0 w 9. In this case, the office
code may look like an area code (if the second
digit is 0 or 1). If so, the PERCEPTlONe or
PERCEPTIONex looks for a DD prefix (1) to
identify whether or not the next 3-digit number
is an area code. When ICC is used, 0 + a 3-digit
number is always an areacode. When ICC is not
used, the system identifies the area code by
looking at the second digit of the first 3-digit
number (if this digit is 0 or 1, the number is an
area code; if not, the number is an office code).
Inward WATS: This is a form of long distance
service without a charge to the originating party.
,.
- -..
t
i;-
.-1
--
i 'i
,'
-_.
The area code is always 800.
In PERCEPTIONeLex LCR, this type of call
can be programmed (in the PAR table) as
either a regular DDD call with an area code
of 800, or as a toll free 800 call, routed via the
-2-
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