I don't think you need to depose skype or hangouts to be successful. I'd be happy with a fraction of their users. I'm in the process of creating an addon righ

I don't think you need to depose skype or hangouts to be successful. I'd be happy with a fraction of their users. I'm in the process of creating an addon right now (firertc.com) that has a few features that the others lack. Unique DIDs, call recording, caller-id manipuation, browser integration, etc.