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(Stored as LCR.CFG)
Least-cost routing is the method by which a telecom carrier is selected on a trunk provided by another telecom carrier. 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 want to use another carrier because their prices are cheaper. If you don't have a direct connection to the other carrier, you need to tell 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. Even though you are using a BT line from your premises to the exchange, you will use the other carrier's lines 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 which carrier to pass the call over to.
This 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.
For example, your least-cost-routing file may look like this:
This configuration would route a dialled number of 166001615905900 to 01615905900 (Manchester) via the MCIWorldcom network, for instance.