cordless phone/doorbell

I know, you look at the Subject line and go "WHAT?", but if there was a product that ties a doorbell into a cordless phone then you could hear the phone ring or the doorbell wherever in your house or section you happened to be. I am outside a lot (with my phone of course) but often fail to hear the doorbell ring. But wait, there's more! Imagine if the doorbell was a miniature handsfree phone in itself, then you could check who was actually at the door, and if it was a door to door seller you could simply say "no", without having to so in person. Did I say that was all! No there's even more to this fantastic idea. If you are out you could auto divert your phone to your cellphone (I know that various telecommunications company's have this capability already), but of course your doorbell/handsfree phone would also divert, so you could speak to the caller from wherever you are. This is particularly handy when you are not far from home and can pop back in a few minutes. Or arrange to be home at a certain time...whatever! Now I'm not saying I would pay any price for this product, but it would be high on my shopping list.