This is the home version of the Voice Over Internet Protocol (VoIP) system used by business to significantly lower their telephone costs. It makes and receives calls using a VoIP phone connected to your existing broadband, high-speed Internet connection for far less expense than traditional phone services. Complete phone packages are available, including unlimited local and long distance calling, Caller ID, Voice Mail, Call Waiting, Enhanced 911, and more, for less than $20 a month (subscription information included). Your cable or DSL modem plugs directly into the base telephone, while the 5.8 GHz cordless handset can be used throughout your home or office. Up to nine additional handsets can be added (sold separately). This unit supports one VoIP phone line and online security features such as an internal firewall and port filtering. 9" H x 11" W x 5 3/4" L. (5 lbs.)