Learn all about Google Hangouts voice calls and Google Hangouts video calls in this free lesson.
Google Hangouts also allows you to make international and domestic phone calls. Most calls to anywhere in the United States and Canada are free, while calls to destinations in other countries can me made with low rates. Other than this, the only thing your computer needs is a microphone and speakers.
You'll need a Google Voice account in order to receive voice calls in Google Hangouts. However, you can make outgoing calls without one.