Use Dial-less Phones for Ringdown, Courtesy or Emergency Applications The K-1500P-D (desk) and K-1500P-W (wall) phones features a standard wall or desk configuration with a built-in ringer. Both are available in two colors: red or ash. The K-1500P-D or K-1500P-W can be used on an analog PABX station port or standard C.O. line to receive calls. It can also be used with a dedicated ringdown circuit, such as Viking's DLE-200B, to provide cost effective point-to-point communications.