I worked at a help desk one summer and every inbox had a different sound effect. We had several different external customers each with a dedicated machine to handle their tickets. The most critical customers (i.e. the biggest fines) got the loudest, most annoying sounds. Everything was an animal sound so the place literally sounded like a zoo on busy days. The manager absolutely hated bringing various big shot tours through our call center because of the ridiculous noise but we also had a perfect record.