You'll be told of any plugin you may be required to download to make it work.
It's as easy to use as selecting a contact from the "Viber Only" section of your contact list, and then using the video button to start the call.
More » Another way to video chat on a computer is with oo Voo, which lets you do so with up to 12 people at once!
Like Skype, you can make phone calls to non-oo Voo users (like landlines) if you want to pay a fee.
In the mobile market, Skype has since long been dethroned by Whats App and Viber, but it still remains the most prominent tool for free communication on computers.
Besides, users who don't know much about Vo IP tend to subconsciously interchange the words Vo IP and Skype.