Google has now added phone numbers that hyperlink to Google Hangouts for voice dialing and calling.
If you search for your favorite place on Google Local, Google may show a big phone number, depending on your query. That phone number is hyperlinked to open using Google Hangouts and do phone dialing and voice over Hangouts.
Here is a screen shot showing it in action:
When you click the phone number, it opens Google Hangouts in a new pop up window:
Then it asks you if you want to call and if there are costs associated with the call: