We already know that Google has been working for a while now on completely migrating the functions of Google Voice into Hangouts, so that it can merge most of its communication apps into one (besides Gmail).
We're getting closer to that reality now, as Google has added support for making phone calls via Hangouts from the Google Voice website — and you don't even need Google+.
To get started, just go to your Google Voice account (Google.com/Voice) and when you go to make a call, select “Hangouts” as a “phone to call with.”
It's a nice new addition, although not major, but still a step closer to full integration.
Source: +Alex Wiesen
