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https://github.com/eliggett/speak-freely-legacy

The original Speak Freely from 1994-2002. This is the ancestor to IRLP, has RTP and encryption
https://github.com/eliggett/speak-freely-legacy

irix irlp rtp rtp-streaming sunos voip

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The original Speak Freely from 1994-2002. This is the ancestor to IRLP, has RTP and encryption

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README 

        

                        Speak Freely for Unix

                Voice Communication Over Data Networks



                            by John Walker

                     Release 7.6  --  March 2003



The  phone  company  never gives you a break!  You pay a fortune for a

leased line connection to the Internet, and you *still*  have  to  pay

every  time  you  want  to chat with somebody, even though you're both

sitting in front of workstations with digital audio capability, linked

by  a  fast  network.  Speak Freely for Unix can intercommunicate with

Speak Freely for Windows, available from my Web  site  listed  at  the

end.



Speak Freely for Unix can currently be built for the following systems

(assuming they are equipped with suitable sound hardware):



          System                        Ported By

  =========================== =============================

  SunOS 4.1.x                 John Walker

  Silicon Graphics IRIX 5.3   John Walker

  Solaris 2.4 (SPARC and x86) Hans Werner Strube

  FreeBSD                     Andrey A. Chernov

  Linux                       A host of volunteers

  Hewlett-Packard             Marc Kilian



Speak Freely for Unix uses the workstation audio hardware and  network

to   allow   bidirectional   conversations  right  over  the  network.

Workstations on local area networks  can  generally  communicate  with

excellent  audio  quality  and  response.   A  software implementation

(developed  by  Jutta  Degener   and   Carsten   Bormann,   Technische

Universitaet  Berlin) of the compression algorithm used in GSM digital

cellular telephones allows operation over  Internet  links  of  modest

bandwidth.   By  using  GSM  compression  in  conjunction  with sample

interpolation, the data rate can be reduced to about 9600 baud.  Users

with  CPUs  too  slow or two heavily loaded to perform GSM compression

and decompression in real time may select less compact but quicker  to

execute ADPCM coding, using an implementation developed by Jack Jansen

of the Centre for Mathematics and  Computer  Science,  Amsterdam,  The

Netherlands.



Sound  can  be  encrypted  either  with  a  key  supplied in a file, DES

Blowfish, and/or IDEA with given key(s).   The  DES  implementation  was

developed by Phil Karn, KA9Q. The Blowfish encryption module and the DES

encryption library used  for  encrypting  and  decrypting  VAT  and  RTP

protocol  packets  were developed by Eric Young.  The Blowfish algorithm

was invented by Bruce Schneier and is in the public  domain.   The  IDEA

algorithm  was  developed  by  Xuejia  Lai  and  James L. Massey, of ETH

Zurich.  The implementation used in Speak Freely for Unix  was  modified

and  derived  from original C code developed by Xuejia Lai and optimized

for speed by Colin Plumb.  The IDEA[tm]  block  cipher  is  patented  by

Ascom-Tech  AG.  The Swiss patent number is PCT/CH91/00117, the European

patent number is EP 0  482  154  B1,  and  the  U.S.  patent  number  is

US005214703.   IDEA[tm]  is  a trademark  of Ascom-Tech AG.  There is no

license fee required for noncommercial use.  Commercial users may obtain

licensing  details  from  MediaCrypt AG at [email protected].  You can

use IDEA encryption for noncommercial communications without  a  license

from  MediaCrypt AG; commercial use is prohibited without a license.  If

you don't want to obtain a license from Ascom-Tech, use  Blowfish,  DES,

or key file encryption instead.



The Silicon Graphics audio drivers are based on  the  stand-alone  SGI

Netfone developed by Paul Schurman of Espoo, Finland.



Key generation for IDEA and DES encryption uses an  implementation  of

MD5  message-digest algorithm based on a public domain version written

by Colin Plumb in 1993.  The algorithm is due to Ron Rivest.



Complete instructions for Speak Freely  for  Unix  are  given  in  the

manual  pages.   You can view the manual pages on your screen with the

command:



    make manpage



To build the program, edit  the  Makefile  and  set  the  #defines  as

appropriate  for your system and preferences, then make.  If the build

is successful, the executables for all the Speak Freely programs  will

be in the build directory.



All files in the speakfree root directory are in  the  public  domain:

"Do  what  thou  wilt  shall be the whole of the law".  I'd appreciate

receiving any bug fixes and/or enhancements, which I'll incorporate in

future versions of the program.  Please leave the original attribution

information  intact  so  that  credit  and  blame  may   be   properly

apportioned.



Please  see the readme and/or copyright files in the adpcm, celp, des,

gsm,  and  idea   subdirectories   for   information   regarding   the

distribution and conditions of use of those components.



AUTHOR

        John Walker

        http://www.fourmilab.ch/