当被叫手机无法开通的情况，被叫可设置关机彩铃，如开会，上课，睡觉等等。而主叫拨通被叫手机，判断被叫是否关机，如果关机，则播放提前预设的关机彩铃，这样主叫也可知道被叫因为什么原因而关机。-When the called phone can not open the case, called ring tones can be set off, such as meetings, classes, sleep and so on. The caller dials the called phone,