OpenVox A400E40 features four FXS ports. This card is modular, allowing you to interchange, remove or replace the ports as your network requires. The OpenVox A400E40 telephony card includes a PCI Express interface.
OpenVox's A400E series cards, including the A400E40, is compatible with available OpenVox FXS-100 and FXO-100 modules, and Digium X100M and S100M modules. This card is interoperable with many open source and proprietary platforms, including Asterisk, trixbox, Elastix and more.