About voice and video chat
Sometimes reading a chat message doesn't deliver the same impact as hearing the message or having a face-to-face conversation. You might therefore want to use voice and video capabilities in your Gmail chat. From within Gmail, you can have an actual voice conversation with someone, or even chat face-to-face over video.
When you participate in a video call in Gmail, you can join or start a video call with up to 15 other people using the full functionality of Google Hangouts for Google Apps.
See Make a computer-to-computer voice or video call and review the Hangouts system requirements to get started using video calls in Gmail. For more information about voice and video calls features in Talk or Hangouts chat, see our feature comparison chart.
Note that Hangouts in Gmail and Calendar respect the Google Admin console setting for disabling video calls. If you have video calls disabled, users won’t be able to participate in Hangouts or the legacy video chat functionality.To disable Hangouts video calls