VoIP is a method of transmitting audio and video over an internet connection. VoIP or IP telephony is a technology that facilitates the transfer of telephone data over the internet, transforming the internet into a medium of communication analogous to a telephone. Additionally, VoIP is occasionally abbreviated as Voice over IP. VoIP is a method of delivering voice channels over the internet as packets using a pre-existing streaming (CODEC) standard, such as H.225 or H.323. This permits callers to bypass the telephone to make long-distance calls over a free network. VoIP. A protocol for transmitting voice via an Internet connection. Refers to a variety of techniques for encoding and transmitting voice over an IP network, such as an internal ethernet or the internet.