Linux.com: Voice-Over-IP For LinuxOct 23, 2000, 15:17 (1 Talkback[s])
(Other stories by Alex Young)
"The advantages of using the Internet for voice communications are instantly recognized by most people: Low or no cost long-distance telephone calls and the added flexibility Internet-based applications give over the technological dinosaur, the telephone. In addition, both conference calls and video conferencing are possible with suitable compression technology and adequate bandwidth. It is even estimated that by 2002, 15% of all voice traffic around the world will be carried by IP networks."
"There are even Internet-to-phone programs available such as dial-pad. Most commercial solutions for voiceover IP, however, are limited to Windows and Macs. There are, however, free and open source projects available for Linux."
"The first voice-over-IP program I looked at was Speak Freely, developed by John Walker and Brian C. Wiles. Speak Freely is a complete Internet telephone solution featuring conferencing, an answering machine and encryption. There are both Unix and Windows clients. Interestingly, Speak Freely offers many compression protocols including GSM, ADPCM, LPC and LPC-10."