STU-I
Secure telephone / From Wikipedia, the free encyclopedia
This article is about a secure telephone. For Stu as a common name, see Stuart (disambiguation).
For other uses, see STU (disambiguation).
The STU-I, like its successors sometimes known as a "stew phone", was a secure telephone developed by the U.S. National Security Agency for use by senior U.S. government officials in the 1970s.[1]