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- Asterisk - The Open Source Linux PBX
- A complete Linux PBX (private branch exchange) software for VoIP networks; it is inter-operable with almost all standards-based telephony equipment using relatively inexpensive hardware.
- Asterisk Documentation Project - Asterisk: The Future of Telephony--Online Book
- This detailed guide to Asterisk covers installation, configuration, and integration of Asterisk with existing phone systems, without the need for additional hardware. Available for download in PDF format. Published by O'Reilly, 2nd edition, 2007.
- Asterisk Guru - Tutorials and HOWTOs for the Asterisk PBX and VoIP in General
- A resource site for Asterisk, Linux PBX software for VoIP networks, as well as general information on VoIP. This site has tutorials, user forums, reviews, tools, and a database of VoIP providers organized by country.
- Building an Asterisk@Home Test Lab
- Links to a three-part series on setting up a small production Asterisk iPBX on the cheap. Aimed at Linux and telephony noobs. (2006)
- CPhone @ SourceForge
- A cross-platform IP telephony client.
- Ekiga - Free Your Speech
- A GPLed SIP and H.323-compatible VoIP, IP telephony, and video conferencing application; formerly called GnomeMeeting.
- Free Telephony Project
- The goal of this project is to provide free hardware designs for telephone systems. Both the hardware and software are free and open.
- GNU Bayonne - Telephony Server of the GNU Project
- A multi-lingual site.
- GNU Gatekeeper - OpenH323 Gatekeeper
- A full-featured H.323 gatekeeper, available freely under GPL license. It forms the basis for a free IP telephony system (VOIP). Multilingual documentation available. Latest release is 2.2.7, 2008-04-02.
- KPhone
- An Internet phone application for Linux. Latest version is 1.0.2.1, 2006-09-22.
- Kiax - Just Talk!
- A software phone (soft phone, VoIP client) with a simple and comfortable user interface for making VoIP calls to Asterisk PBX.
- Linphone
- An internet phone or Voice Over IP phone (VoIP). Latest release is 2.0.0, 2007-11-19.
- Network Caller ID (NCID)
- A cross-platform client/server network caller ID package; features include support for multiple clients and caller ID systems, name and number aliasing, call logging, and a TiVo client.
- OpenWengo - Freedom to Call, Freedom to Code
- A GPL-licensed, cross-platform telephony software.
- Skype - The Whole World Can Talk For Free
- A cross-platform VoIP telephony application. Runs on Linux, but this is free (as in beer) proprietary software.
- Speak-Freely
- A cross-platform Internet telephony (Voice Chat) application; latest version: 7.6a, 2004.
- The Definitive Guide to VoIP for Linux Users | VoIP Now
- A comprehensive guide to the best VoIP resources. (2008)
- Tribox
- An Asterisk-based BPX phone system for small-to-medium size businesses. Formerly called Asterisk@Home.
- Twinkle
- A telephony application for voice over IP communcations using the Session Initiation Protocol (SIP).
- VoIP Wiki
- A reference/resource guide for VoIP (Voice over IP) networks including software, hardware, service providers, reviews, configurations, standards, tips & tricks and everything else related to VoIP networks, IP and Internet telephony.
- VoIP-4D Primer - Online Book
- This guide, geared to both technical and non-technical readers, deals with building voice infrastructure. The examples in this guide provide essential background for building low-cost telephony systems. Available for download [1.8 MB] in Arabic, English, French, and Spanish. (2006)
- Yate - Yet Another Telephony Engine
- An extensible telephony engine for VoIP and PSTN (Public Switched Telephone Network); voice, video, data and instant messaging can all be unified under this flexible routing engine.
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