Openvox FXO400 Quad Channel FXO for A810 A1610 A2410 GW1202Model: FXO400Retail Price: $139 Overview The FXO400 Quad FXO module allows OpenVox Analog A810 A1610 A2410 series cards to terminate four analog telephone lines (POTS) per module. Because of the modular design, users can activate additional ports at any time with more FXS400 or FXO400 modules. The FXO400 module passes all the call features any standard analog telephone line will support. Functions: FXS Foreign Exchange Station FXO Foreign Exchange