Glossary PC Personal Computer. The most common type of computer that most people use. DECT Digital Enhanced Cordless Telecommunications. This is the most widely used wireless telephony standard in Europe. USB Universal Serial Bus. A widely used standard for computer connection units. VoIP Voice over Internet Protocol. This is what Internet telephony is called. PSTN Public Switched Telephone Network. Standard name for ordinary telephony throughout the world. What is Skype™? Skype™ is a program that enables telephone calls to be made over the Internet. You can make calls to other Skype™ users and to ordinary telephone numbers throughout the world. Internet telephony In brief terms, Internet telephony is telephony over the Internet and not over ordinary telephone wires.