OpenVox FXO402 Dual CH Quad FXO Module for A810 A1610 A2410Overview The FXO402 Dual channels Quad FXO module allows OpenVox Analog A810 1610 2410 series cards to terminate two analog telephone lines (POTS) per module. Because of the modular design, users can activate additional ports at any time with more modules. The FXO402 module passes all the call features any standard analog telephone line will support. Functions: FXS Foreign Exchange Station FXO Foreign Exchange Office An FXS device initiates and sends