VoIP is an acronym which stands for "Voice Over IP". Most of us are familiar with the "Public Switched Telephone System” (PSTN), which allows us to contact people around the globe by dialing a sequence of numbers. VOIP offers an alternative, which works by routing digitized voice signals over IP networks, such as Company Intranets, or in some cases the public Internet.

On the face of it, the PSTN hasn't really