Toshiba DP5022-SD 10 Button Speaker/Display Phone (NON-BACKLIT) The Toshiba DP5022 is a digital phone that boasts a 4-line 10 button LCD screen, one touch programmable buttons, an ergonomic design, and programmable buttons that condense operational sequences. The SD version is compatible with a wide range of Toshiba digital systems, but to get the most of the phone we recommend using the Toshiba CIX/CTX release 5.1 or later.