Toshiba DKSUB40i Base Cabinet (Refurbished)Toshiba DK40i phone system base cabinet is equipped for 8 digital phone stations and no phone lines. Phone lines may be added with an optional TCOU card that loads into the base cabinet. The maximum capacity in the base unit is 4 lines and 8 phones. The system can grow to 12 lines and 24 digital stations with the addition of an expansion cabinet and expansion circuit cards.