Voice over Internet Protocol(VoIP) is a more than common term of 'phone over the Internet'. If you have got a sensible quality Internet connexion then you can acquire telephone services delivered to your Internet connection. Before reaching the destination, the engineering converts voice into regular telephonic signal. By using this service, you can directly do telephone calls from your computing machine with the aid of a particular VoIP telephone or a traditional phone connected to a particular adapter. This mathematical function can either be included into the telephone itself or in a detached box like a Analogue Terminal Adapter(ATA).