Least-cost routing configuration

Least-cost routing is the process of selecting a telecoms carrier on a trunk provided by another telecom carrier, based on cost. It is usually a four-digit code dialled before a number that instructs the telephone exchange to pass the call to another carrier, rather than carry it itself.

For example, you may have lines supplied by British Telecom, but you may want to choose a different carrier because their prices are cheaper. If you don't have a direct connection to the other carrier, you need to inform the British Telecom exchange not to try to connect this call directly, but route it to the other carrier's network for them to connect. Although you are using a BT line from your premises to the exchange, the other carrier's lines will be used from the exchange to your call's destination. Each carrier has its own access code which, when prepended to the dialled number, the BT line will recognise to which carrier to pass the call over.

This LCR.CFG file contains a list of such access codes, along with the tariff table you wish to use to cost calls routed by this particular code.

To open the file access the main installation folder and to make any changes, follow the example below:

This configuration would route a dialled number of 166001615905900
to 01615905900 (Manchester) via the MCIWorldcom network, for instance.

It is recommended to add any LCR codes from the main interface...