iphone turned into normal cord phone?

I don't know if this company is still around, but they had a product called Dock-n-talk. You plugged your cell phone into it and it would charge your phone. At the same time it would plug into one of your house hold phone outlets. This would make all the phones hooked up to your cell phone. So if you needed to make a phone call, you would just pick up any home phone and dial out with that and it would make the call with your cell phone. And if someone called your cell phone, all the phones in your house would ring and you could pick up any house hod phone to answer it.