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:

    “‘Guess now who holds thee?’—‘Death,’ I said. But,
    there,
    The silver answer rang, . . . ‘Not Death, but Love.’”
    —Elizabeth Barrett Browning (1806–1861)

    “However low and poor the taking Snuff argues a Man to be in his own Stock of Thought, or Means to employ his Brains and his Fingers, yet there is a poorer Creature in the World than He, and this is a Borrower of Snuff; a Fellow that keeps no Box of his own, but is always asking others for a Pinch.”
    —Richard Steele (1672–1729)