VOIP phones work by sending your phone call information over a secure internet connection. In many ways this works in exactly the same way as a conventional phone line. The main difference is that by using the internet you can reach multiple people across the globe and you can do so without any loss of sound quality. It is even possible to send a video signal with your call and see each other whilst you talk.
There are several reasons why VOIP has become such a valuable part of the business community; it is important to consider these when deciding if VOIP is right for your business or not.
-See more at: Is a VOIP Phone Right for Your Business?