Digium® analog cards were created for connecting analog telephones and analog POTS (Plain Old Telephone System) lines to the PSTN through a PC. With these cards, users can transport calls from POTS to POTS, POTS to PBX, or POTS to VoIP. Using one of our analog cards in concert with Digium's Asterisk® software, standard PC platforms, and the Linux® OS, one can create telephony solutions capable of satisfying the needs of business applications with industry-leading quality.
To support our analog interface cards, Digium manufactures analog modules for both Foreign Exchange Station (FXS) extension-side interfaces and Foreign Exchange Office(FXO) trunk-side interfaces. These modules are built both in single-port, for smaller installations, and quad-port, where density is important. The analog cards, with their interchangeable single and quad FXS and FXO modules, can eliminate the requirement for separate channel banks or access gateways.
Read more details at:
http://www.digium.com/en/products/analog/
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