NEC DSX40 Kit has an initial configuration that starts with 4 incoming lines, 8 digital station ports and 2 analog station ports with the capability to expand to 6 incoming line, 24 digital station ports and 18 analog station ports.

Includes:

(1) Key service unit (4x8x2) ----Part # 1090001

(3) 22- Button Display Telephones ----Part # 1090020