If you are on a call and go out of the operating range, you will hear three low tones. You will hear a single mid tone when you are back in range. If you stay out of range, any active call will be suspended. The call will be re-established when you walk back into range. If you remain out of range for more than 5 minutes, the system will drop the call. If you are not on a call and go out of the operating range and then press the call button, you will hear a single tone for the button press and then three low tones to signify the failure to make a link.