That'd be fine, provided I could port my existing number to their service, get a replacement number from my provider, and then buy a handset that would make calls from my number appear as though they come from the ported number (as you can with Android and Google Voice).
I guess a device that could forward a phone call after a number of rings would do it, but I don't think one exists for PSTN.
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Their vision of how you would use their service is to to use their number as your main number, and forward to your home phone.
That'd be fine, provided I could port my existing number to their service, get a replacement number from my provider, and then buy a handset that would make calls from my number appear as though they come from the ported number (as you can with Android and Google Voice).
I guess a device that could forward a phone call after a number of rings would do it, but I don't think one exists for PSTN.