Ask HN: Best remote worker video chat solution?

I would like to have a constant connection with my remote co-workers. The problem is that many of them are in somewhat noisy envoirments (including me), so keeping a constantly open audio/video connection is not possible.

I would simply like som kind of group video chat with a push-to-talk possibility. My testing so far has concluded that neither Skype nor Google Hangouts support this.

What do the rest of you use?