Will VoIP work with a cable modem - 
Source: Creative Commons, Solace Consultants
Service Use VoIP using the wideband cable will usually provide better audio quality and better phone calls. VOIPo, Phone Power and Phone.com are the best VoIP services that allow you to connect your cable modem.
VOIPo, one of our favorites because of its simplicity, does not require software downloads, and you do not need to go to your computer to use it. Simply connect the broadband connection and use your regular phone. Phone and power phone.com services use a broadband connection as well. You connect a cable or DSL modem, they'll connect to your phone power servers quickly and efficiently.
compare a variety of VoIP services!