[pyotrgalois]

Thanks! This link works fine. I was not aware of it existence. I has a too long URI but it is way better than having to go to google plus and go to the the bottom right corner so that start a hangout button appears.

I am going to replace my Start button created by hangouts js library with a link to this URI.

EDIT: I just replaced the google hangout button created via js with google's framework by a direct link :).