Voice over IP (internet protocol), aka VoIP, is the technology that lets you make voice calls using broadband connections. This means that unlike with phone calls, you don’t need a public-switched telephone network (PSTN) to make a call.

Voice over Internet Protocol (VoIP), is a technology that allows you to make voice calls using a broadband Internet connection instead of a regular (or analog) phone line.

Voice over Internet Protocol (VoIP) is a technology for communicating using "Internet protocol" instead of traditional analog systems. Some VoIP services need only a regular phone connection, while others allow you to make telephone calls using an Internet connection instead.

Voice over Internet Protocol (VoIP) is the use of Internet Protocol for transmitting voice communications. Internet Protocol is a network-layer communications protocol for relaying datagrams across network boundaries. Voice over IP delivers digitized audio as data packets which can be transmitted over intranets, extranets, and the internet.