| Asterisk 
Asterisk is a complete PBX in
software. It runs on Linux, BSD and MacOSX and provides all of the
features you would expect from a PBX and more. Asterisk does voice over
IP in many protocols, and can interoperate with almost all
standards-based telephony equipment using relatively inexpensive
hardware.
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| FreeSWITCH
FreeSWITCH is an open source telephony platform designed to
facilitate the creation of voice and chat driven products scaling from
a soft-phone up to a soft-switch. It can be used as a simple switching
engine, a media gateway or a media server to host IVR applications
using simple scripts or XML to control the callflow.
We support various communication technologies such as SIP, H.323, IAX2
and GoogleTalk making it easy to interface with other open source PBX
systems such as sipX, OpenPBX, Bayonne, YATE or Asterisk.
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| Gnophone
Gnophone is an open source internet telephone that allows you to make calls to other GnoPhone users or to an Asterisk PBX
Gateway. It supports a fully featured web interface allowing you to
participate in various discussion groups. It also supports the full
rate GSM codec for great quality that doesn't require very high
bandwidth.
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| Open Source SIP
Open Source SIP is a project created to foster the development of
commercially viable SIP applications. Started in March of 2006, the
Open Source SIP project is sponsored by Solegy, and draws on over six years of research and development.
The goal of Open Source SIP is to attract and encourage like minded
advocates of SIP who can collectively advance the evolution of the next
generation SIP ecosystem through the creation of innovative new
applications. We encourage both users and developers to get involved in
the community process. Developers can opt to proceed to the OSS GForge site.
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| Pingtel
Pingtel is
transforming the way enterprises deploy IP voice communications with
the industrys first field-proven, SIP-based open source enterprise
communications suite.Unlike proprietary VoIP
solutions currently available, Pingtels SIPxchange communications
suite gives small-to-medium-sized businesses control over when and how
to deploy VoIP technologies. As the industrys only open source
SIP-based IP PBX, SIPxchange not only removes the barriers that have
prevented rapid and pervasive deployment of enterprise VoIP, but also
delivers freedom from vendor technology lock-ins. Enterprises benefit
from more flexibility in terms of integration and lower total cost of
ownership.
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| sipX
sipX is the leading open source IP PBX in terms of
scalability, robustness and ease of use. The sipX IP PBX has been
successfully deployed in a lot of places. The largest known
installation serves more than 5,000 users connected to one redundant
(HA) system. Small installations go all the way down to a few users
served by very low cost hardware.
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| Yate
Yate - Yet Another Telephony Engine
is a next-generation telephony engine; while currently focused on Voice over Internet Protocol (VoIP) and PSTN,
its power lies in its ability to be easily extended. Voice, video, data
and instant messaging can all be unified under Yate's flexible routing
engine, maximizing communications efficiency and minimizing
infrastructure costs for businesses.
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The List 
