http://www.voip-info.org/wiki/view/Open+Source+VOIP+Software

http://blog.csdn.net/xuyunzhang/article/details/26859341

Asterisk

Asterisk is an open source framework for building communications applications. Asterisk turns an ordinary computer into a communications server. Asterisk powers IP PBX systems, VoIP gateways, conference servers and other custom solutions. It is used by small businesses, large businesses, call centers, carriers and government agencies, worldwide. Asterisk is free and open source. Asterisk is sponsored by Digium.

SIP Proxies

• Mini-SIP-Proxy A very tiny perl POE based SIP proxy
• MjServer cross-platform SIP proxy/registrar/redirect, written in java, based on MjSip stack
• MySIPSwitch SIP Proxy server which allows using multiple SIP accounts with a single SIP login
• NethidPro3.0.6 Opensource Sip Encryption Bridge: www.vonets.com
• Net-SIP A Perl SIP framework that includes a stateless proxy
• OpenJSIP Opensource distributed standalone SIP proxy, SIP registrar, SIP location service run by Java VM. Based on OpenSIPS forked from OpenSER.
• partysip SIP proxy server
• SaRP SIP and RTP Proxy in Perl
• sipd SIP Proxy

• theSIP router/proxy/jack-in-all-trades from IPtel.org
• Siproxd SIP and RTP Proxy
• SIPVicious tool suite: tools for auditing sip devices
• sipX The SIP PBX for Linux: Complete, native SIP PBX solution from Vocal SIP softswitch with H.323 and MGCP translators for non-SIP endpoints
• Yxa Written in the Erlang programming language

SIP Clients (UA's)

Linux clients:

• H.323 audio
  and video softphone for various linux, solaris, windows, and various unix systems. Formerly Linphone audio
  and video SIP softphone for Linux and Windows XP
• minisip cross-platform
  SIP softphone, Linux, Windows XP and soon Windows Mobile 2003 SE
• OpenSIPStack MPL

  licensed SIP stack with ENUM, Presence (XMPP/SIMPLE) and NAT traversal.
  Reference implementation of Session Border Controller (OpenSBC)
  available.

• Peers Minimalist
  SIP softphone written in java (tested on linux and windows)
• SIP softphone
  in Python, runs on Windows, Mac, Linux
• SipToSis frommhspot.com Skype
  SIP UA - Multiplatform - Open Source
• YateClient is
  multiprotocol and multiplatform softphone with H.323, SIP, Jingle and IAX support.
• Linphone backend

MacOS X clients:

• SIP softphone
  in Python, runs on Windows, Mac, Linux
• http://www.mhspot.com Skype
  SIP UA - Multiplatform - Open Source
• YateClient skinnable
  VoIP client based on QT library which supports H.323, SIP, Jingle and IAX protocols

Windows clients

• H.323 audio
  and video softphone for various linux, solaris, windows, and various unix systems. Formerly JPhone Rich
  software SDK support softphone development, Windows, Linux, ThreadX, Vxworks etc.
• Linphone audio
  and video SIP softphone for Linux and Windows XP
• minisip cross-platform
  SIP softphone, Linux, Windows XP and soon Windows Mobile 2003 SE
• OpenSIPStack MPL

  licensed SIP stack with ENUM, Presence (XMPP/SIMPLE) and NAT traversal.
  Reference implementation of Session Border Controller (OpenSBC)
  available.

• Peers Minimalist
  SIP softphone written in java (tested on linux and windows)
• SIP softphone
  in Python, runs on Windows, Mac, Linux
• SipToSis frommhspot.com Skype
  SIP UA - Multiplatform - Open Source
• wxCommunicator Windows
  softphone based on sipXtapi and wxWidgets 2.8.x, multi-account, conferencing, NAT support
• YateClient is
  multiprotocol and multiplatform softphone with H.323, SIP,Jingle and IAX support.

SIP tools

• Open Source Asterisk AMI: Open Source Asterisk AMI interface application
• SIP
  SIMPLE Command Line Tools for SIP sessions (complete console
  based SIP UA) and SIMPLE Presence (Publish, Subscribe, Notify) and XCAP
  document manipulation

• SIP Protocol Stacks and Libraries

  • Aloha Spring
    based J2SE SIP A/S which leverages optimistic concurrent model and supports multiple persistence models
  • eXosip -
    eXtended osip library
  • libdissipate SIP
    stack
  • minisip includes
    a SIP stack
  • MjSip -
    complete and powerful java-based SIP library for both J2SE and J2ME platforms.
  • Open
    Sip Stack MPL licensed SIP stack with ENUM, Presence
    (XMPP/SIMPLE) and NAT traversal. Reference implementation of Session
    Border Controller (OpenSBC) available.
  • Verona based
    Active/X plugin for IE allowing ClickToDial functionallity
  • reSIProcate SIP
    stack and sample Application from SailFin Adds
    SIP support the the Java GlassFish Application Server
  • sipXtackLib an
    RFC 3261, 3263 complient SIP stack from http://sofia-sip.sourceforge.net Sofia-Sip
    is SIP stack implementation with STUN and presense support
  • Twisted Python
    protocol stacks and applications includes SIP support
  • Verona -
    GPL licenesed VOIP engine based on oSIP,eXosip,oRTP,ffmepg, works on Linux,Windows Mac-OS/X
  • YASS - Statefull SIP stack used inYate written

    in C++ usable for client, server or proxy in a multithread or single
    thread model. It's working on both Windows and Linux, it's very small
    but full featured.

  H.323 Clients

  Linux clients:

  • H.323 audio
    and video softphone for various linux, solaris, windows, and various unix systems. Formerly YateClient is
    multiprotocol and multiplatform softphone with H.323, SIP and IAX support.

  MacOS X clients:

  • YateClient skinnable
    VoIP client based on the QT library which supports H.323, SIP, Jingle and IAX protocols

  Windows clients:

  • H.323 audio
    and video softphone for various linux, solaris, windows, and various unix systems. Formerly YateClient is
    multiprotocol and multiplatform softphone with H.323, SIP and IAX support.

  H.323 Gatekeeper

  • GNU
    Gatekeeper - for Linux, Windows, Mac etc.

  IAX clients

  • IAXComm for
    Linux, MacOS X and Windows
  • Kiax -
    for Linux, Windows and MacOS, based on iaxclient, GPL
  • QtIax fromYateClient is
    multiprotocol and multiplatform softphone with H.323, SIP and IAX support.

  RTP Proxies

  • RTP Protocol Stacks

    • ccRTP C++
      library based on GNU Common C++
    • JRTPLIB C++
      object oriented RTP library
    • libRTP part
      of gnome-o-phone
    • libzrtpcpp -
      ZRTP extension library for ccRTP stack
    • oRTP Written
      in C, running on linux, win32 and arm-linux.
    • RTPlib C
      library
    • sipXmediaLib RTP

      + audio bridges, audio splitters, echo suppression, tone from
      generation (e.g. DTMF), streaming support, RTCP, G711 codecs, etc. from Secure RTP - see:YRTP -Yate RTP
      stack, that can be used in other projects.

    • zrtp4j -
      ZRTP stack for Java, based on GNU ZRTP, used in SIP Communicator

    MSRP Relays

    • XCAP servers

      • Other tools

        • Encours Teleconferencing
          in your web browser with an integrated VOIP layer (Java) and an optional Asterisk connectivity on the server side.
        • MORCC -
          automated online Calling Card store. Paypal integrated.
        • OgonPhonesXML .NET
          Library for Aastra SIP Phones and Cisco SIP/IP phones for fast and easy XML Interfacement.
        • Oreka capture

          and retrieval of SIP, Cisco Skinny (SCCP) and raw RTP sessions with
          audio compression, rdbms metadata storage and web based user interface.

        • Voipong -
          Voice over IP (VoIP) sniffer and call detector.
        • Vomit converts
          a Cisco IP phone conversation (recorded with TCPdump) into a standard WAV file

        PBX platforms

        Some of these include SIP proxy functionality

        • H.323 and
          other protocols
        • FreeSWITCH Open
          Source PBX and Soft Switch
        • sipX -
          The SIP PBX for Linux from YATE Yet
          Another Telephony Engine - supports

          IVR platforms

          • YATE Yet
            Another Telephony Engine
          • See Also: 
            

            Voicemail servers

            • YATE Yet
              Another Telephony Engine with H.323, SIP and IAX support.

            Speech

            Text-to-speech and speech-to-text (voice recognition)

            • Fax Servers

              • Development platforms, protocol stacks

                • H.323 Protocol
                  Stack following on from the original openH323
                • SS7 Protocol
                  Stack
                • H.323 Protocol
                  Stack Developed in C
                • ++Skype C++
                  library for skype add-on

                  platform independent software development. It is platform independent,
                  easy to use, and easy to extend because of the flexible library design,
                  inspired by modern C++ design ideas. Performance is one of the goals.

                Radius Servers

                • RadBox RADIUS
                  Server + Billing System. (For a work, you nead instal Framework 2.0)

                Billing

                • See

                  Codecs

                  • See

                    Middleware

                    • Suite Solutions

                      • CTI Dialer utilities

                        • TALK Powerful

                          directory management and scalable architecture to create Click to call
                          or Select and Dial applications + AJAX libraries to implement these
                          features in your web site.