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This Digium PCI Express card, model: 1A8B04F, features four FXS ports and four FXO ports. The Digium A8-series can support up to eight modular analog ports, meaning the modules can be removed and replaced to meet your own customized specifications. Carrier-grade echo cancellation is designed to provide quality audio between any analog or VoIP solutions connected to the Digium 1A8B04F PCI Express card.