It's available today, it's just not a product called "Duplex". Android has call screening and "hold my call" and phone menu tree detection. On select Google Map

It's available today, it's just not a product called "Duplex". Android has call screening and "hold my call" and phone menu tree detection. On select Google Maps listings, you can make reservations by clicking a button which will make a phone call in the background to make a reservation.