The Digium A4 PCI Express allows you to connect your Asterisk system with analog lines, telephones, fax machines and more with Digium's top notch analog interface cards. The A4 Series of analog cards supports up to 4 connections per card in your Asterisk system. By using Digium's single-port interface modules, the A4 board can support from 1 to 4 ports. The modular nature of the cards affords you the ability to mix and match between FXO and FXS interfaces. This gives you the precise port configuration necessary for your system.
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