The routing of voice conversations over the Internet or any other IP
-based network. The voice data flows over a general-purpose packet-switched network, instead of traditional dedicated, circuit-switched voice transmission lines. In general, phone service via VoIP
costs less than equivalent service from traditional sources. Some cost savings are due to using a single network to carry voice and data, especially where users have existing under-utilized network capacity they can use for VoIP
at no additional cost. One must note that the maximum upstream in your Internet connection is the final throttle and service is not as good as standard telco services. VoIP
phone calls (even international) are widely regarded as free. While there is a cost for their Internet service, using VoIP
over this service usually does not involve any extra charges, so the users view the calls as free.