The Gentner DH30 Digital Audio Broadcast Hybrid Phone Line Interface (also sometimes referred to as the Gentner DH30 Digital Hybrid) is a professional telecommunications device designed for broadcast environments, seamlessly integrating standard analog phone lines into a production audio console. Its primary function is to deliver clear, broadcast-quality audio from a caller while preventing "feedback" or "hollow-sounding" echo (known as the hybrid function). It provides robust control for talk shows, news feeds, and remote interviews.