VoIP is an acronym for Voice over Internet Protocol it is basically the transmission of telephone communications over networks such as the internet. Since 2004, VoIP technology has become more mainstream, which has allowed individuals to be able to use the technology to make free call. As most homes in the United States now have a high speed internet connection, VoIP is an evolving technology that gives people another option for phone services.
Try Voip demo. You can then run any free applications.