Includes the X16 voice server equipped for connection to 4 telephone lines but expandable to 6 telephone lines. Comes with four X16 Digital Speakerphones but is expandable up to 16 telephones. These are in the fashion color-Charcoal. Auto attendant answers and processes calls Voicemail call waiting caller ID "Cell phone like" navigation keys. External call forward Live call recording Outgoing call log Personal phone book. Easy to see blue and green HS leds External message/music-on-hold interface. Includes "self-install" modular connector package and "self install" Quick start guide.