It will forward calls to any number of phones that you provide them. It's not an actual VoIP application/server though.
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Google Voice is perfect for a widget for your site so people can call you. But if you want to full blown number and stuff I would go get a a SIP provider (Skype of SIP) and then get a extra computer and put windows on it and go get (3CX) and you have automated menu and a call center all for only 10.00 a month for the skype number and the line
I have it for my company, if you want to give it a quality test call it, it is on my website. The thing is THE BEST!