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1. INTRODUCTION
1
.Ol
This document
has two main purposes:
a) to
describe
the Least Cost Routing
(LCR) and Toll
Restriction
(TR) features,
and b) to serve as a
supplement
to Section 200-255-300,
System Pro-
gramming,
in order to guide the service technician
in LCRflR
programming.
Various examples,
tables,
and flowcharts
are provided to clarify feature expla-
nations.
a .02 This document
assumes
that the reader
is
familiar
with
PERCEPTIONekex
programming
procedures
and the mnemonics
used with the LCR
and TR data entry utility programs.
2. GENERAL DESCRIPTION
2.00 Least Cost Routing (LCR)
2.01
Least
Cost Routing
causes
the system
to
select the least expensive
trunk available
for that
particular time of day. The station user simply dials
an LCR access code and the required
telephone
number.
LCR will then select the optimally-priced
route and automatically
delete
and/or
insert any
necessary
digits (for MCI, Sprint, etc.) by analyzing
the dialed telephone
number
(including
area code
and, in some cases, office code).
2.02 The three variable
time schedules
per 24-
hour clock allow the end-user
to take advantage
of
rate variations
during
these
hours.
The various
routing combinations
for the three time schedules
are contained
in 15 Route Tables.
Each table is
selected
as a function
of the dialed
telephone
number.
2.03
The
LCR feature
is compatible
with
and
transparentto
all other PERCEPTIONehex
features.
It is designed
so that it is completely
disabled
until
a simple parameter
(LCR) is enabled
in the System
Data Block
(DSYS Program).
2.04
If a Direct Trunk Access code (not the LCR
access code) is dialed, the outgoing
call is handled
as a normal direct trunk access call without
using
LCR.
PERCEPTIONeh,
LCR/TR PROGRAMMING GUIDE
MARCH 1991
2.05
LCR Data Blocks are separated
from all other
Data Blocks.
It is unnecessary
to change
a com-
pleted Data Block when adding the LCR feature to
a system already in use, except to assign the LCR
access code
(DACD Program)
or to enable
LCR
(DSYS Program).
2.06 There are three LCR classes (LCI , LC2, and
LC3), which allow specific
stations
to be denied
access to the most expensive
routes.
LC3 is the
lowest class; LCl is the highest.
LC3 routes are
always
selected
first, no matter
what
class the
station is allowed.
If all LC3 routes are busy, and
the calling station is allowed LC2, the system will try
to select an LC2 route in the order programmed.
If
LCl is allowed,
and all LC2 routes are busy, the
system will try to select an LCI route.
l
The Class of Service
Data Block indicates
the
LCR class of that particular
Class of Service.
l
A warning tone is received
by the station user if
the last choice
route is selected
(if the WTA
prompt,
PAR table,
DLCI Program,
is pro-
grammed
to Y).
l
If all the routes are busy, busy tone is received
by the station user, who may then activate the
Automatic
Callback
feature.
The station
will
then be called when the first trunk in that sta-
tion's LCR class is idle.
When
the station
answers
the callback,
the idle trunk will be
seized and the telephone
number
will be auto-
matically
dialed out to the distant end.
2.07
All of the above logic and the remainder
of the
Least Cost Routing
and Toll Restriction
features
are described,
and can be followed step-by-step,
in
the Detailed Logic Flowchart.
Thisflowchartcan
be
used as a fault finding procedure
for customer
data
programming,
and to answer
questions
regarding
what
will happen
when
certain
parameters
are
programmed
in a certain way.
2.10 Toll Restriction (TR)
2.11 The Toll Restriction
(TR) program
causes the
system to restrict (or not restrict) specific stations
from calling certain area codes and/or office codes.
2.12 Toll Restriction
can be used for long distance
toll restriction,
for restriction
in the local area (home
area), or both.
The TR class also decides whether
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