Wiktionary

silver box

English edit

 
English Wikipedia has an article on:
Wikipedia

Noun edit

silver box (plural silver boxes)

  1. (telephony) A modified DTMF box that adds four additional keys, creating a four-column-by-four-key grid.
Retrieved from "https://en.wiktionary.org/w/index.php?title=silver_box&oldid=77849167"