Panasonic KX-NT305 Features Compatible with KX-TDA50G, KX-TDA100, KX-TDA200, KX-TDA600, KX-TDE100, KX-TDE 200, KX-TDE 600, KX-NCP500, KX-NCP1000 Panasonic Phone Systems Panasonic KX-NT305-B is an add on DSS Console for 60 Additional Programmable Feature Buttons for Panasonic IP Phones The NT305 can be added as a side car to the Panasonic KX-NT343 IP Phone and Panasonic KX-NT346 IP Phone This DSS Console is often used for additional buttons on a receptionist phone so they can take a quick glance and see whether a user is on the phone or available for a call The Programmable Buttons can be used for BLF/DSS (Busy Lamp Field/ Direct Station Select Buttons), Line Appearances, Ring Groups, Voice Mail Transfer, Door Opener Control The KXNT305 connects to the IP Phone with a ribbon cable