56k=v.Unreliable

 http://modemsite.com/56k/index.asp News and information about 56k modems. Extensive troubleshooting section.

Avinta Communications

 http://www.avinta.com Manufacturer of a system allow multiple phone extensions to share a single phone line.

Captaris

 http://www.captaris.com Maker of several computer telephony products, including CallXpress, RightFAX, MediaLinq, and Infinite Mobile Delivery.

Compuware Corporations

 http://www.compuware.com/ Provides products, services and solutions that help IT professionals develop, integrate, customize, test and maintain business-critical applications.

Future Software

 http://www.futsoft.com Data communications software, telecom software, largest communication software development company in India with a wide range of protocol stacks and software products

InnoMedia

 http://www.innomedia.com Voice gateway products, including InfoTalk voice over IP appliance. Includes InnoSphere global network based on these gateways.

Modems, Modems, Modems

 http://modems.rosenet.net/ lots of modem-related resources

Multi-Tech Systems

 http://www.multitech.com/ Manufacturer of voice-over-IP (VOIP) gateways, gatekeepers, voice modems, and other datacom equipment.

NANP Administration

 http://www.nanpa.com/ North American Numbering Plan for the Public Switched Telephone Network

Navas 28800-56K Modem FAQ

 http://modemfaq.home.att.net/ A comprehensive source of information on modems, emphasizing practical advice on how to select and use them effectively.

Paradyne Corporation

 http://www.paradyne.com/products/ Designs, develops and manufactures broad band modems for high-speed DSL, WAN, Internet access and multimedia applications.

Performance Technologies, Inc.

 http://www.pt.com/ Signaling System 7 (SS7) products to extend telecommunications networks

Sniffer Technologies

 http://www.sniffer.com Network monitoring, analysis, reporting and capacity planning tools, from Network Associates.

Vovida.org

 http://www.vovida.org Open source site for computer telephony software

Western Telematic, Inc.

 http://www.wti.com/ Search products or by application on Remote Reboot Units, Remote Port Switches, DC/AC Rack Mount Modems, Fall Back Switching, Telnet-to-Async Port Switches.