Cortelco 255409 Vba 20m Traditional Mini Wall Phone Volume Ivory Tone Dial Single Gong Ringer Cortelco traditional mini-wall phone. Tone dial. Single-gong ringer. Ringer volume control. Handset volume control dial on handset. Slide-mount (connector is male, fits directly onto a wall mount jack without need for a 3 feet line cord, see also SE-630LCCU-50, a wall jack with built-in DSL filter). Ivory.