Shoutbox

Is there any program or coding out there that can automaticly play a sound when someone wants to talk to you? So it sees when someone opens a chatwindow with you and then u automaticly send a sound that you downloaded (for example)..is there anything like that out there? or does anyone know how to do this?

thank you in advance.

Nothing like that exists AFAIK, but it's possible in a plugin.