Well, after a lot of trawling through archives, I found the post I reproduce in full below.  Is it time to get together to develop a tcp/ip standard for crypto voice that we could then layer on point-to-point SLIP as *the* free standard for crypto voice like pgp is for mail?  (PS Note the date of this post.  Appropriate, huh? :-) )  --- From jpcampb@afterlife.ncsc.mil Thu Jul  9 11:50:11 1992 From: jpcampb@afterlife.ncsc.mil (Joe Campbell) Newsgroups: comp.compression.research Subject: Re: sound compression algorithms Date: 4 Jul 92 14:46:04 GMT Organization: The Great Beyond  In article <1992Jun26.165210.15088@sequent.com> lff@sequent.com (Lou Fernandez) writes: >The techniques for production systems revolve around Code Excited Linear >Prediction (CELP) algorithms which capture 20 ms or so of speech and >attempt to match the speech with a combination of signals from a >codebook, choosing the combination which minimizes the error....  In case you'd like to experiment with CELP, you can obtain a software implementation of the 4800 bps Fed Std CELP coder for free:  The U.S. DoD's Federal-Standard-1016 based 4800 bps code excited linear prediction voice coder version 3.2 (CELP 3.2) Fortran and C simulation source codes are now available for worldwide distribution at no charge (on DOS diskettes, but configured to compile on Sun SPARC stations) from:  Bob Fenichel National Communications System Washington, D.C.  20305 1-703-692-2124 1-703-746-4960 (fax)  In addition to the source codes, example input and processed speech files are included along with a technical information bulletin to assist in implementation of FS-1016 CELP.  (An anonymous ftp site is being considered for future releases.)  Copies of the actual standard "Federal Standard 1016, Telecommunications: Analog to Digital Conversion of Radio Voice by 4,800 bit/second Code Excited Linear Prediction (CELP)" are available for $2.50 each from:  GSA Rm 6654 7th & D St SW Washington, D.C.  20407 1-202-708-9205  The following articles describe the Federal-Standard-1016 4.8-kbps CELP coder (it's unnecessary to read more than one):  Campbell, Joseph P. Jr., Thomas E. Tremain and Vanoy C. Welch, "The Federal Standard 1016 4800 bps CELP Voice Coder," Digital Signal Processing, Academic Press, 1991, Vol. 1, No. 3, p. 145-155.  Campbell, Joseph P. Jr., Thomas E. Tremain and Vanoy C. Welch, "The DoD 4.8 kbps Standard (Proposed Federal Standard 1016)," in Advances in Speech Coding, ed. Atal, Cuperman and Gersho, Kluwer Academic Publishers, 1991, Chapter 12, p. 121-133.  Campbell, Joseph P. Jr., Thomas E. Tremain and Vanoy C. Welch, "The Proposed Federal Standard 1016 4800 bps Voice Coder:  CELP," Speech Technology Magazine, April/May 1990, p. 58-64.  For U.S. FED-STD-1016 (4800 bps CELP) _realtime_ DSP code and information about products using this code, contact:  John DellaMorte DSP Software Engineering 165 Middlesex Tpk, Suite 206 Bedford, MA  01730 1-617-275-3733 1-617-275-4323 (fax) dspse.bedford@channel1.com  DSP Software Engineering's code can run on a DSP Research's Tiger 30 board (a PC board with a TMS320C3x and analog interface suited to development work) or on Intellibit's AE2000 TMS320C31 based 3" by 2.5" card.  DSP Research                Intellibit 1095 E. Duane Ave.          P.O. Box 9785 Sunnyvale, CA  94086        McLean, VA  22102-0785 (408)773-1042               (703)442-4781 (408)736-3451 (fax)         (703)442-4784 (fax)