It presents itself as an option under my features. It has it listed as being 19.99 a month with unlimited minutes. Not sure if it's really available to me since the availability checker they have keeps failing. If I talked on the phone a lot at my house, I'd see it as better suited to my needs than my VOIP.
After all, why have multiple phone numbers and pay separately for each. It seems like it could be a VOIP killer if handled right.