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With the four included FXS modules and a carrier-grade echo cancellation unit, the Digium 1A4B06F PCI Express card is ideal for analog and VoIP systems. Use this PCI Express card to leverage existing analog equipment. The Digium 1A4B06F PCIe card is scalable, meaning you can mix and match up to four analog modules. This card is interoperable with Asterisk.
