STU-III Secure Telephone Units, Crypto Key Generators, Encryption Equipment and Scramblers

http://www.tscm.com/stu.html

a less sophisticated telecommunications infrastructure. STE, however, is automatically secure if both callers are using STE systems and the phones exchange codes in the time it ta

Vintage Computing and Gaming | The Retrogaming and Retrocomputing Blogazine

http://www.vintagecomputing.com/

computer platforms and telecommunications from an early age. I still think this summary of differences might be useful to people in the future since it is coming from the perspect
Adventures in vintage computers and retrogaming. Includes articles on classic games and obsolete computers.

Asterisk™: The Definitive Guide

http://www.asteriskdocs.org/en/3rd_Edition/asterisk-book-html/asterisk-book.html

Tailor-made private telecommunications networks Low barrier to entry Hosted solutions of similar complexity to corporate websites Proper integration of communications technologies

Find more...