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:

    “Or ever the silver cord be loosed, or the golden bowl be broken, or
    the pitcher be broken at the fountain, or the wheel broken at the
    cistern.
    Then shall the dust return to the earth as it was: and the spirit
    shall return unto God who gave it.
    Vanity of vanities, saith the preacher, all is vanity.”
    —Bible: Hebrew Ecclesiastes (l. XII, 6–7)

    “Franceska: I was happy in the life I built up for myself. I put a fine high wall of music around me and nothing could touch me. I was safe and secure. And then you had to come along and knock it all down and I hate you for that.
    Maxwell: On the contrary, you love me.”
    —Muriel Box (b. 1905)