Save a lot of money
If you don't use VoIP for voice communication, then you are most certainly using the good old phone line (PSTN – Packet-Switched Telephone Network). On a PSTN line, time is really money. You actually pay for each minute you spend communicating on the phone. International calls are much more expensive. Since VoIP uses the Internet as backbone, the only cost you have when using it is the monthly Internet bill to your ISP. Of course you need broadband Internet access, like ADSL, with a decent speed. In fact, unlimited 24*7 ADSL Internet service is what most people use today, and this causes your monthly cost to be of a fixed amount. You can speak as much as you wish on VoIP and the connection cost will still be the same.
More than two persons
On the phone line, only two persons can speak at a time. With VoIP, you can setup a conference with a whole team communicating in real time. VoIP compresses data packets during transmission, and this causes more data to be handled over the carrier. As a result, more calls can be handled on one access line.
Cheap user hardware and software
If you are an Internet user wishing to use VoIP for voice communication, the only additional hardware you require besides your computer and Internet connection are a sound card, speakers and a microphone. These are quite cheap. There exist several software packages downloadable from the Internet, which you can install and use for the purpose. Examples of such applications are the well-known Skype. You do not actually need a telephone set, which can be quite expensive, along with the underlying equipment, especially when you have a phone network.
Abundant, Interesting and Useful Features
Using VoIP also means benefitting from its abundant features which can make your VoIP experience very rich and sophisticated, both personally and for your business. You are thus better equipped for call management. You can, for example, make calls anywhere in the world to any destination in the world with your VoIP account. Features also include Caller ID, Contact Lists, Voicemail, extra-virtual numbers etc.
More than voice
VoIP is based on the IP, which is in fact, along with TCP, the basic underlying protocol for the Internet. By virtue of this, VoIP also handles media types other than voice: you can transfer images, video and text along with the voice. For instance, you can speak to someone while sending her files or even showing yourself using a web cam.