- (Internet) voice over Internet Protocol (usually read as "Voice over IP"), a telecommunications system that uses the Internet or other Internet Protocol network to transmit telephone calls
1996 November 12, IMTC, Inc., comp.dcom.telecom, Usenet, retrieved 2016-11-03, message-ID <firstname.lastname@example.org>:
- The VoIP Forum is dedicated to enabling and promoting industry-wide interoperability between products that send telephony over the Internet and private IP enterprise networks. This interoperability will allow seamless transmission of Internet phone calls regardless of the telephony application used by callers and call recipients. At present, applications from different vendors are incompatible due to fundamental differences in voice coding, silence suppression, addressing and dialing plans, call management and other related functions.
1996 November 13, Sykes, Rebecca, “Group forms to spur Internet telephony”, in Computerworld New Zealand, archived from the original on 2016-11-03:
- VoIP "represents a group of competing companies who've gotten together to agree on standards," Pulver says. "It's very important," and is good news for users, because their co-operation will move Internet telephony forward, he says.
The word "VoIP" has been pronounced variably since the inception of the term. Apart from spelling out the acronym letter by letter, vē'ō'ī'pē, there are three other ways it can be pronounced. Both two-syllable ways, vō'ī'pē and vō'ip, have been used, but generally, the single syllable vŏy'p (as-in voice) has arguably become the more usual pronunciation. 
- Rhymes: -ɔɪp