Mini pabx Capacity: Basic 4 CO lines, 8 extensions (408),expand to 416, 424,432, ... 832,896,1288,1696,1680 Transfer caller ID Mini pabxCapacity: ... Basic 4 CO lines, 8 extensions (408), expand to 416, 424, ... & door open functionAlarmclockPrivate passwordCO line transfer to CO lineExternal broadcasting interfaceKey phone interface (optional ...