An Overview Of Least Cost Routing - Panasonic DBS 824 Installation Manual

An Overview of Least Cost Routing
Least Cost Routing (LCR) is used to automatically place calls along the least
expensive trunks, depending on the carrier supplying the trunk and the time of
day. For example, if calls to Toronto made between 10 p.m. and 2 a.m. are
cheapest using a trunk supplied by Al Telecom, LCR automatically routes
calls to that city, during that time, along Al Telecom trunks.
LCR can also be used to add non-dialed digits to (or delete non-dialed digits
from) the dialed prefix.
LCR Trunk Groups
LCR uses 4 trunk groups, each consisting of 4 trunks. The trunks in each
group are prioritized according to their cost-effectiveness, so that LCR tries
the highest priority trunk in the group first, then the next highest, etc.
Different LCR ttunk groups are used at different times of the day. The time
of day during which an LCR trunk group is used is determined by the Time
Priority Route Tables.
Time Priority Route Tables
LCR uses 6 Time Priority Route Tables to determine which LCR trunk groups
are selected during a certain time of the day. Each Tie Priority Route Table
has three elements. The elements are:
l
Table Number. Time priority Route Tables are identified by numbers l-6.
In DBS 824 programming, the tables are referred to by number.
l
T&e Position andPrioriiy.
- The "position" of a Time Priority Route Table indicates the time
of day during which it is used. For example, a table assigned to
position "1" is used between 7:00 a.m. and 759 am. Similarly,
a table assigned to position "5" is used between 8:00 am. and
459 p.m. LCR provides up to 24 positions for Time Priority
Route Tables.
The 24 positions are divided among 6 time periods; each time period
uses 4 LCR trunk groups. For example, trunk groups assigned to
positions l-4 are used between 7:OO a.m. and 759 a.m.
- The priority of a Time Priority Route Table is determined by its
position. For example, between 7:00 am. and 759 a.m.,
position 1 has the highest priority, while position 4 has the
lowest priority. The most cost-effective Time Priority Route
issued 3/l /95
DBS
824-10-400
8-3