1)CO. line 2-4 2)Ext. line 8-16 3)Multiple Communications Line 4)normal transform power 5)switch power (Optional) 6)backup battary interface (Optional) 7)Power Failure Transfer 8)External Line Caller ID 9)Auto-Attendant(DISA-12s one paragraph) 10)Outgoing Message Recording 11)Internal Music on holding 12)Remote programming 13)Memory protect while power off 14)Auto/Operator mode 15)System Password 16)Flexible Ext. No. Assignment 17)Multiple Dial-Out Mode 18)External line group 19)Call Duration Control 20)Call Pickup 21)Outgoing Call Transfer 22)Call Transfer 23)Call Forwarding 24)Flexible coding(change Ext.No.) 25)Do Not Disturb 26)Automatic EX Reporting 27)Flash Time Choice 28)Ringing Assignment 29)Call Restriction 30)Three Way Conference 31)Call all extensions 32)Specific Co line dialing 33)Ring identify 34)C.O line Booking 35)C.O line Reservation 36)Operator setting 37)C.O Monitor