virtual background noise during a call

[LUIS]

hey guys, I know there are some great software developers here, and I got a challenge for you. G-smart has an application for their pocket pc's called Wise Talk. What it does, is allow the user to choose background noises (such as cars, or airplanes) during a call to create an alibi for those times when you do not want to talk to someone. That way, you can simply tell the other caller that you cannot talk because you are at the airport, and hang up. What say you men (or ladies)? Who among you can write this software for smartphone? Is it even feasible?