Or is that something different from "Google Voice" ?
That's not Google Voice. That's just calling from GMail. Google Voice is something completely different. It's a single number that handles everything for you.
Not so fast. Change the .ca url to anything else (like .fr, .co.jp) and you get the same page. If you change the area selector on the bottom of the page to Canada (instead of United States), and you get a different page with no mention of Google voice.
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