0 abbreviation for Voice over Internet Protocol: technology that allows people to make phone calls over the internet
1 abbreviation for voice over Internet protocol (= a system that allows you to use your computer as a telephone, and your Internet connection as a telephone line):
2 abbreviation for Voice over Internet Protocol: a system for making phone calls over the internet:
The growth of VoIP has been a boon to consumers and businesses looking to cut the cost of long-distance phone calls.
VoIP providers/services/technology