We are updating the Calendar app on Android devices so that Hangout links are available to those viewing meeting events on mobile devices. A “Join Hangout” link will appear in meeting events if a Hangouts video call was added in Calendar. Named Hangout calls will appear the same as non-named calls. The name of the Hangout will not be visible. The “Join Hangout” link is not not editable from the Android Calendar event view. This change only impacts the Google Calendar app on Android devices.
Google Apps for Business and Education
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Reference by :http://www.google.com/