6 January 2011
The following material is intended to supplement the article ``Digital speech and the Internet protocol: the 1974 origins of VoIP,'' which appeared in the IEEE Signal Processing Magazine, Vol. 22, July 2005, pp. 87-90, and the 2010 book ``Linear Predictive Coding and the Internet Protocol: A survey of LPC and a History of of Realtime Digital Speech on Packet Networks,'' A long paper/short book expanding on the basic story and published by Now Publishers. Hardcopies of the book can be purchased at https://www.nowpublishers.com/bookorder.aspx?doi=2000000029&product=SIG or you can use a discounted order form.
The book also appears as a two part paper in Foundations and Trends in Signal Processing, Now Publishers
For other historical information on the Internet, see http://www.pcbargainhunter.com/articles/history-of-the-internet.html
Robert M. Gray