IP Phones - These specialized phones resembling normal phones with a handset, cradle and buttons. But instead of having the standard RJ-11 phone connectors, IP phones have an RJ-45 Ethernet. IP phones connect directly to your router and have all the hardware and software necessary right onboard to handle the IP call. The Wi-Fi phones allow callers to subscribe to VoIP calls from any Wi-Fi hot spot.
Computer to computer - This is certainly the easiest way to use VoIP. You do not even have to pay for long distance calls. There are several companies offering free or very low cost that you can use for this type of VoIP. You only need the software, a microphone, speakers, a soundcard and an Internet connection, preferably a fast one like you would pass through a cable modem or DSL. Except for your normal monthly ISP fee, there is usually no charge for computer to computer calls, no matter the distance.