[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"0001" ofType:@"caf"];
    NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:filePath];
    AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil];
    [fileURL release];
    [audioPlayer prepareToPlay];
    [audioPlayer play];
    [audioPlayer release];