Foreign Exchange Subscriber (FXS) is a telephony interface that connects analog devices (like traditional phones, fax machines, or modems) to VoIP systems or PBX equipment. It provides dial tone, battery current, and ringing voltage to the connected device, allowing it to function over a digital VoIP network. FXS ports are commonly found on VoIP gateways or Analog Telephone Adapters (ATAs), which convert analog signals to digital for seamless integration with IP networks. Businesses transitioning from legacy phone systems often use FXS interfaces to maintain compatibility with existing analog devices while upgrading to VoIP technology. Proper configuration ensures that analog endpoints continue to operate smoothly within an IP-based communication system.
What is FXS?
FXS (Foreign Exchange Subscriber) is an interface that connects analog phones or fax machines to VoIP gateways or PBX systems.
