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Connect up to eight analog plugs into the FXS connections on the Digium 1A8A06F PCI card. This PCI card also features echo cancellation to give phone lines carrier-grade audio quality. The Digium 1A8A06F PCI card is also modular, allowing the ports to be removed or swapped out as needed to support network growth. The A8-series PCI cards from Digium are compatible with Asterisk.