Foreign exchange service (telecommunications)

For the use of this term in finance, see Foreign exchange service (finance).
In telecommunication, foreign exchange service (FX) is a network-provided service in which a telephone in a given exchange area is connected, via a private line, to a central office in another foreign exchange, rather than the local exchange area where the device is located.
To call originators, it appears that the called party having the FX service is located in the foreign exchange area