VOIP is short for Voice Over Internet Protocol.
Voice Over IP involves technology used for making phone calls using the Internet.
The term VoIP stands for Voice over Internet Protocol, a methodology and group of technologies for the delivery of voice communications and multimedia sessions over an internet connection. The costs associated with VOIP calls are often much lower than those made using traditional phone lines, but the technology is still undergoing development to improve the audio quality and connection dependability. Phone services provided over the NBN will use VoIP and will require the phone to be connected to a modem.