Follow the link for details. This sounds like an obvious solution for business as well as individuals.
The first reviews are in for the new Google Voice, the company’s relaunch of Grand Central, which it bought two years ago. The new product enables you to forward all incoming calls to six of your phones, home and mobile, at different locations. It also allows you to listen, or even read through automatic transciption, your phone messages (recorded by Voice) on your PC.