The Panasonic KX-NT500/550 IP Telephone series features the most advanced IP Phone from Panasonic with Wideband High Definition Audio and excellent sound quality through advanced speaker design and expanded acoustic chamber. Together with a sleek, ultra-modern design and large graphic, backlit displays result in more advanced, productive voice communication with “in person” quality. The KX-NT550 and KX-NT560 IP Telephones include a full duplex speakerphone and support for Electronic Hook Switch (EHS).