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Digium 1A4A04F PCI card features two FXO modules and two FXS modules. This PCI card is scalable to four modules and includes echo cancellation. The 1A4A04F PCI card's modules are interchangeable with available FXO and FXO modules to create a PCI card that matches your system's requirements.
With a PCI interface, this Digium card is easy to install. The echo cancellation technology increases voice quality. All of the A4-series PCI cards are compatible with Asterisk.
