FXS (Foreign Exchange Station) is an interface that connects a telephone or other analog device to a VoIP (Voice over IP) system or traditional telephone network. It provides battery current, dial tone, and ring voltage to the connected device, simulating a traditional telephone line. Commonly found in VoIP gateways, ATAs (Analog Telephone Adapters), and PBXs, FXS ports allow users to connect standard analog phones, fax machines, and modems to digital or IP-based telephony systems.
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