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4.6. Least Cost Router
This section deals with the purpose and operation of the gateway cost saving
machine - the Least Cost Router (LCR). Let us explain how it works and can be
configured.
Here is a survey of what you will find in this section:

Least cost routing process;

Routing rules
– destinations, routes, lines and time intervals;

Number normalising;

List of barred numbers (Blacklist);

LCR configuration testing.
The purpose of the Least Cost Router is to find the optimum output line for
the called number. The LCR process has several stages:
Input normalising - the calling and called line numbers are transformed into a
normalised format before entering the LCR.
Destination searching - a destination means the target party to the call. The
destination includes a group and type of line searching in the group. The group is
searched according to the prefix of the normalised called number.
Group searching - a group means a logical set of lines. The group definition
includes a route time limit within a week.
Line searching - a route can consist of one or more lines. The final line is
determined according to the selected line selection algorithm. Three ways of
searching are available: 1)
First free line
– finds the first free line, 2)
Cycle
– selects
the free line with the earliest time of the last call, and 3) Free minutes
– uses the
free line with the highest number of free minutes. Correct call rates must be
selected for the lines for the method to work effectively.
Output normalising - the calling and called line numbers are transformed into a
normalised format before the call is transferred to the output line.