Welcome to the Teledex® website. Please feel free to browse our pages and connect with us for your next hotel property renovation or new construction project. Teledex hotel phones are the most recognized, trusted, and preferred phones in the world. In 1982, Teledex invented the very first, and still most popular hotel telephone in the world...the Teledex Diamond. Since then, more than 15 million Teledex brand hotel phones have been installed in 125 countries.