Summit & Summit 800
Feature Description and Operation Manual
Issue 1.2
176
2.54
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.
Your 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 you access 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 you dial digits that match an Internal LCR code in the LDT (Leading Digit Table), an
outside Line is selected and digits are modified using the DMT (Digit Modification Table).
2. Loop LCR
If you dial 9 (the 1st available Line Group 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 an outside Line from the assigned Line
Group and sends digits from the DMT.
3. Direct CO LCR
If you select a
{LINE}
or
{LINE GROUP}
button, the Direct CO LCR mode is accessed. If
the dialed number matches a Direct LCR code in the LDT and the seized 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 Tables can be configured for each station and outside Line.
3. Leading digit entries may be duplicated in the Leading Digit Table. Using a different
