SystemSoundID soundID = 0;
CFURLRef soundFileURL = (CFURLRef)[NSURL URLWithString:somePathString];
OSStatus errorCode = AudioServicesCreateSystemSoundID(soundFileURL, &soundID);
if (errorCode != 0) {
  // Handle failure here
}

AudioServicesPlaySystemSound(soundID);

SystemSoundID SoundID;
NSString *soundPath = [[NSBundle mainBundle] pathForResource:@"beep" ofType:@"caf"];
NSURL *soundURL = [NSURL fileURLWithPath:soundPath];
AudioServicesCreateSystemSoundID((__bridge CFURLRef)soundURL, &SoundID);
AudioServicesPlaySystemSound(SoundID);