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The only hardware that is absolutely required for Residential VOIP is a high-speed Internet connection -- cable TV or DSL, for example. Most VOIP providers will give you an adaptor that lets you plug your home phone into the Internet connection. If you want to integrate VOIP into an existing home network, you can get a router that's VOIP-friendly, and use it as your network hub. You will need a computer, however, to use Skype, the popular no-cost VOIP service that's getting a lot of attention right now.