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The FXO must be connected to the Foreign Exchange Station interface, or FXS interface. The FXS interface delivers the familiar dial tone and ring tone to the FXO and supplies the power for the FXO device to work. IN A NUTSHELL FXO is any device that, from the point of view of a telephone exchange, seems to be a regular telephone. As such, it should be able to accept ring signals, go on-hook and off-hook, and send and receive voice signals. SEE ALSO
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