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Digium 1A8A04F is a modular PCI card that supports up to eight analog connections. This PCI card includes four FXS and four FXO connections. Swap out the modules on the Digium 1A8A04F PCI card to change its configuration and your network grows. The included echo cancellation lends the PCI card carrier-grade audio quality. This PCI card is compatible with Asterisk systems.