The Avaya Partner 18D 18 Button Display Phone is a business phone set designed for office use. It features a conventional system with a DSL/Phone interface, making it compatible with existing phone lines. The Avaya 3158-07B model offers a sleek design and easy-to-use interface, ideal for businesses looking to enhance their telecom systems. With its reliable Avaya brand and specific model number, this phone set provides a dependable and efficient communication solution.