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Analog Telephony  

Since 2001, Digium® has designed, manufactured, and sold PC-based telephony cards for extending the functionality of Asterisk® to the Public Switched Telephone Network (PSTN). All Digium analog cards are RoHS compliant and manufactured in an ISO 9001:2001 certified facility in the United States. Each Digium card is backed by a five (5) year hardware warranty as well as our Exceptional Satisfaction Program (ESP). Digium, as a globally minded company, ensures that all Digium analog interface cards maintain telecom, safety and emissions certifications permitting their use in Australia, Canada, the European Union, and the United States. Check with your reseller to ensure that your country is on our current list. If it isn't, let us know.

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. Digium's analog cards utilize patent pending VoiceBus™ technology. VoiceBus technology allows these cards to use an industry standard, bus-mastering interface as found in millions of PCs worldwide. VoiceBus maximizes system compatibility and prevents system conflicts.

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. Digium's commercial, toll-quality High Performance Echo Cancellation (HPEC) software is available to our analog customers at no additional cost. The optional VPMADT032 hardware echo cancellation module provides the same toll-quality as HPEC, but without the performance impact of a software based solution. Scaling of an analog card solution is accomplished by adding additional cards.