I went out to Sonics to park and have a desert.I pressed the red service button once and recieved no answer, then after waiting a few minutes I decided to press it again thinking that perhaps they were quite busy.Still no answer, so I pressed it three more times and still nothingI thought that maybe this particular unit may be out of order, so I moved to another, only to be further disappointed after pressing the button several times.Then finally I just gave up and left. I just don't understand it.