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With a modular design, the Digium A4B04F PCI Express card can be mixed and matched with up to four FXO and FXS modules. The 1A4B04F PCIe card includes two FXO ports and two FXS ports. Utilize the Digium 1A4B04F card to connect analog and VoIP solutions. The echo cancellation technology built into this Digium card compliments audio quality. The Digium A4B04F PCIe card is compatible with Asterisk.
