VoIP allows you to make telephone calls using a computer network, over a data network like the Internet. VoIP converts the voice signal from your telephone into a digital signal that travels over the internet then converts it back at the other end so you can speak to anyone with a regular phone number. When placing a VoIP call using a phone with an adapter, you’ll hear a dial tone and dial just as you always have.
Cost
Free VoIP to VoIP
Low cost VoIP to Public Switch Telephone
Network (PSTN)
Less bandwidth requirements
Low cost / no cost software and hardware
Mobility
Any internet connection