What do the terms FXO and FXS mean?

FXO = Foreign Exchange Office
FXS = Foreign Exchange Station

An FXO device is a device that you connect to an analog telephone line and it lets you make calls from VoIP lines to the PSTN network and vice versa. Click here to see or purchase our FXO that has been tested to work with our software.

An FXS device lets you use an analog telephone to make calls to VoIP numbers.

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