Panasonic central model 824 used, like new, very clean, 16 internal lines, 6 external lines, price 350 SAR Panasonic central model 824 used, like new, very clean, 8 internal lines, 3 external lines, price 300 SAR Panasonic central model 308 used, with an expansion switch, 6 internal lines, 150 SAR. The central unit comes with the switch.