VOIP basically means Voice over internet protocol and this protocol greatly increases the value of communication through out the world.
To set up and start working with a VOIP protocol you would need the standard audio settings on your computer and of course a client (a user) to communicate with.
It is one of the best replacements for long distance phone calls and the only negative sides of the VOIP protocol is that calls can suddenly end due to a weak connection.
The way VOIP works is that it transfers the frequency signals into digital data and then sends it to another user.
There is also a way that you can use the VOIP protocol from a phone if you have the special adapter to connect it to the computer.The computer must also be connected to the Internet.