Many CCTV Systems installed today have the ability to record audio in addition to video. In fact, many of the cameras sold today even have built-in microphones. Audio recording seems like a great feature to offer to your customers, but you have to be careful. In most situations, the covert recording of audio is ILLEGAL!.
Dating back to the early wire tap laws, the Federal Government has take serious steps to protect people from having their conversations secretly recorded. This is why an answering machine beeps; to warn you that you are about to be recorded. Even in places where there is no reasonable expectation of privacy, like in the middle of a public store or office, it is usually against the law to record someones conversation without them knowing.
This is why we strongly recommend that in any situation that audio being is recorded, you include Audio Warning Signage that is placed in clear obvious locations. We use specially phrased signs just for this purpose. They warn everyone: Your voice is being recorded! To be safe, you need to make sure that there is no doubt in anyone’s mind that Audio is being recorded in addition to video.