If you’ve never heard of VoIP, get ready to change the way you think about long-distance phone calls. VoIP, or Voice over Internet Protocol, is a method for taking analog audio signals, like the kind you hear when you talk on the phone, and turning them into digital data that can be transmitted over the Internet.
How is this useful? VoIP can turn a standard Internet connection into a way to place free phone calls. The practical upshot of this is that by using some of the free VoIP software that is available to make Internet phone calls, you’re bypassing the phone company (and its charges) entirely.
An IP PBX is a phone system that operates over the Internet (or Internet Protocol, “IP”) as opposed to traditional analog phone lines. IP PBXs generally cost less and provide as good or better quality as traditional landlines, plus they’re typically capable of providing advanced phone system features like mobility, call routing, conferencing, and more.