The Toshiba DKT2020-S is a 20 button programmable phone built for Toshiba Strata phone systems. A full duplex speakerphone is built into the phone that allows for high quality conference calls. The phone's 20 programmable buttons allow for a wide configuration of options such as additional CO lines, extensions, or intercom keys added to the phone. Additional programmable buttons can be added with a DADM2020 add on module.