Ericsson iPECS-100, Feature Description And Operation Manual

Page: 148 / 464

iPECS-LIK
Feature Description & Operation Manual
Issue 6.1
127
2.51 LCR (LEAST COST ROUTING)
Description
The LCR Tables are employed to define appropriate routing for outgoing calls based on the
dialed number. Generally, the LCR Tables are structured to define the Least Cost Route for
Long Distance calls.
User dialed digits are compared to table entries and modified based on time of day, day of
week, and assigned routes. There are four LCR Tables: LCR Control Attributes, LCR Leading
Digit Tables, LCR Digit Modification and LCR Initialization Tables.
LCR Access modes are assigned in the LCR Control Attributes Table. These modes define the
manner in which the user accesses the LCR function. LCR may be disabled or one or more of
the three access modes can be allowed to access LCR. The basic modes are:
1. Internal LCR
If the user dialed digits match an Internal LCR code in the LDT (Leading Digit
Table), a CO/IP path is selected and digits are modified using the DMT (Digit
Modification Table).
2. Loop LCR
If the user dials 9 (the 1st available CO line access code) or presses a {POOL} or
{LOOP} button to place a call, the Loop LCR mode is accessed. Dialed digits are
compared to the Loop LCR codes in the LDT; the system will seize a CO/IP line
from the assigned CO/IP Group and sends digits from the DMT.
3. Direct CO LCR
If the user selects a {CO}/{IP} or {CO/IP GROUP} button, the Direct CO LCR
mode is accessed. If the user-dialed number matches a Direct LCR code in the
LDT and the seized CO/IP line belongs to the assigned Direct CO LCR group, the
system will send digits modified based on the DMT.
Operation
System
Operation of LCR is automatic based on assignments in the system
’s LCR Tables
Conditions
1. There are a total of 6 LCR access mode combinations that can be defined as below:
1) LCR Access Mode 00 (M00)
– LCR is disabled.
2) LCR Access Mode 01 (M01)
– Loop LCR access is active.
3) LCR Access Mode 02 (M02)
– Loop and Internal LCR access are active.
4) LCR Access Mode 11 (M11)
– Direct CO and Loop access are active.
5) LCR Access Mode 12 (M12)
– Direct CO, Loop and Internal LCR access
are active, seize Co line according to the LCR attributes.
6) LCR Access Mode 13 (M13)
– Direct CO, Loop and Internal LCR access
are active, seize CO line according to the station attributes.
2. Multiple Leading digit table can be provided for each station, CO line.