Features: 1) Min. lines: 2 - 08 2) Max. lines: 8 - 32 3) Expansion (function board) 4) Expansion (extension and CO line) 5) Multiple communication lines: 8 6) Normal transformed power 7) Switch power (optional) 8) Backup battery interface (optional) 9) Billing software (including program, optional) 10) Power failure transfer 11) External line caller ID 12) Transfer caller ID (optional) 13) Intercom caller ID 14) Auto-attendant (DISA: 20s, three paragraphs) 15) Auto-attendant (DISA: 12s, one paragraph) 16) Outgoing message recording 17) Automatic CO distinguishing 18) External music input on holding 19) Internal music on holding 20) Day / night mode (optional) 21) Door bell and door opener (optional) 22) Alarm clock (optional) 23) Remote programming 24) Real time clock (optional) 25) Memory protection while power off 26) Automatic / operator mode 27) System password 28) Flexible extension number assignment 29) Multiple dial-out modes 30) External line group 31) Call duration control 32) Call pickup 33) Outgoing call transfer 34) Call transfer 35) Call forwarding 36) Flexible coding (change extension number) 37) Do not disturb 38) Automatic EX reporting 39) Flash time choice 40) Ringing assignment 41) Call restriction 42) Three way conference 43) CO line transfer to CO line 44) Call all extensions 45) Specific CO line dialing 46) Ring identify 47) CO line booking 48) CO line reservation 49) Operator setting 50) CO monitor