Features Specifications:PABX (CPS-Z ) System  PABX CPS-Z  Features:  1) Min.: 108 2) Max.: 308 3) Multiple communication line 4) Normal transform power  5) Power failure transfer  6) External line caller ID  7) Auto-attendant 8) Outgoing message recording  9) Internal music on holding  10) Auto / operator mode  11) Flexible ext. no. assignment (optional)  12) Call duration control  13) Call pickup  14) Outgoing call transfer  15) Call transfer  16) Do not disturb  17) Ringing assignment  18) Call restriction  19) Three-way conference