Features: 1) CO lines: 2 - 4 2) Extension lines: 8 - 16 3) Multiple communications lines 4) Normal transformed power 5) Switch power (optional) 6) Backup battery 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 protection while power off 14) Auto / operator mode 15) System password 16) Flexible extension number assignment 17) Multiple dial-out modes 18) External line group 19) Call duration control 20) Call pickup 21) Outgoing call transfer 22) Call transfer 23) Call forwarding 24) Flexible coding (extension number change) 25) Do not disturb 26) Automatic EX reporting 27) Flash time device 28) Ringing assignment 29) Call restriction 30) Three-way conference 31) Call all extensions 32) Specific CO line dialing 33) Ring identification 34) CO line booking 35) CO line reservation 36) Operator setting 37) CO monitor