PABX System Capacity: Basic 4 CO lines, 8 extensions (408), expand to 416, 424, 432, 832, 848 ... Multiple communication line PABX System Capacity: Basic 4 CO lines, 8 extensions (408), expand to 416, 424, 432, 832, 848 ... coding (change ext.No.)Do not disturbAutomatic Ext. reportingFlash time choiceRinging assignmentCall restrictionThree way conferenceCall all extensionsSpecific CO line dialingRing ...