As far as I know, Google+ Hangouts doesn't let you call people. Is there a way to actually just phone somebody with it, the phone on their computer rings, and

As far as I know, Google+ Hangouts doesn't let you call people. Is there a way to actually just phone somebody with it, the phone on their computer rings, and they answer it? Preferably with a standalone client, as I can't guarantee I'd remember to open and leave open a browser tab.