Silver Box

A silver box is a modified DTMF keypad that adds the four additional keys used in the now-obsolete autovon phone system. This was usually accomplished with the addition of a toggle switch and a crystal that switched one column of a standard phone keypad into the "fourth column" used in the Autovon system. (These keys were used to set the priority level of a call, and are the red keys in the photo on the right. More information is available in the Autovon article.)

Modern phones with an integrated circuit based DTMF generator can frequently be modified by simply soldering a wire from the 1633 Hz leg to a switch that toggles between that leg and the 1477 Hz leg for the rightmost column of keys.

Phreaking boxes
  • Beige Box
  • Black Box
  • Blue Box
  • Clear Box
  • Gold Box
  • Green Box
  • Magenta box
  • Orange box
  • Red Box
  • Silver box
  • Vermilion box
  • Mute box

Famous quotes containing the words silver and/or box:

    “Sing, siren, for thyself, and I will dote;
    Spread o’er the silver waves thy golden hairs,
    And as a bed I’ll take them, and there lie.”
    —William Shakespeare (1564–1616)

    “A box of teak, a box of sandalwood,
    A brass-ringed spyglass in a case,
    A coin, leaf-thin with many polishings,
    Last kingdom of a gold forgotten face,
    These lie about the room....”
    —Philip Larkin (1922–1986)