Features: Min 2-08 Max 8-32 Expansion(function board) Expansion(Ext&Co line) Multiple Communications Line 8 normal transform power switch power (Optional) backup battary interface (Optional) Billing Software(include program) (Optional) Power Failure Transfer External Line Caller ID Transfer caller ID (Optional) Intercom Caller ID Auto-Attendant(DISA:20s three paragraphs) Auto-Attendant(DISA-12s one paragraph) (one 20s) Outgoing Message Recording Automatic CO Distinguishes External Music Input on holding Internal Music on holding Day/Night mode (Optional) Door Bell & Door Opener (Optional) Alarmclock (Optional) Remote programming Real time clock Optional Memory protect while power off Auto/Operator mode System Password Flexible Ext. No. Assignment Multiple Dial-Out Mode External line group Call Duration Control Call Pickup Outgoing Call Transfer Call Transfer Call Forwarding Flexible coding(change Ext.No.) Do Not Disturb Automatic EX Reporting Flash Time Choice Ringing Assignment Call Restriction Three Way Conference C.O line transfer to C.O line Call all extensions Specific Co line dialing Ring identify C.O line Booking C.O line Reservation Operator setting CO Monitor