Receiving a computer-to-computer voice or video call
You can receive Google+ Hangouts invitations and voice calls (from one computer to another) in Chat. Just download the Google voice and video call plug-in and sign in to Chat to get started.
Whenever someone calls you in Chat, you'll hear a sound notification and a chat window will appear. To answer a voice call, click the Answer button in the chat window, or click Join Hangout to accept your hangout invitation. You can ignore the call by clicking the Ignore button.
If you miss your call, don't worry. The chat window will open with a message saying who attempted to call you.
Caroline is a Hangouts expert and author of this help page. Leave her feedback about the page below.