It is the business practice of sending all clients' billing info to a separate company, who then does everything for you. It also allows a company to cut down on time and human resources spent on administrative tasks.
Voice of IP of VoIP technology, is the one which completely changed the telecommunications market by transmitting voice over the Internet. During past several years it expanded in such a way that right now it covers each and every corner of the world and it became the new standard of telecommunication. Nowadays there are plenty of companies offering different kinds of services and devices.