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General

• GNU/Unesco Software Directory : Telephony
• SIPfoundry: Organzation for development of Open Source VOIP Software, founded by Pingtel in cooperation with Vovida.org and the reSIProcate community

SIP Proxies

• sipd SIP Proxy
• SIP Express Router (SER): the SIP router/proxy/jack-in-all-trades from IPtel.org
• partysip
• SaRP SIP and RTP Proxy in Perl
• Siproxd SIP and RTP Proxy
• sipX The SIP PBX for Linux: Complete, native SIP PBX solution from SIPfoundry
• Vocal SIP softswitch with H.323 and MGCP translators for non-SIP endpoints
• Yxa: Written in the Erlang programming language
• JAIN-SIP Proxy

SIP Clients (UA's)

Linux clients:

• Kphone
• Linphone
• minisip
• SFLphone, open-source multiplatform multi-protocol VoIP client
• SJphone (free but not open)
• sipXphone from SIPfoundry, previously known as the Pingtel phone

MacOS X clients:

• SJphone (free but not open)
• X-Lite (free but not open)

Windows clients:

• Shtoom: SIP softphone in Python, runs on Windows, Mac, Linux
• SIP COMMUNICATOR Java based softphone
• SJphone (free but not open)
• sipXphone from SIPfoundry, previously known as the Pingtel phone
• X-Lite (free but not open)

SIP tools

• Callflow: Generates SIP Call Flow diagrams
• SIP-CallerID: SIP Caller ID retrieval and lookup
• SIPbomber: SIP proxy testing tool
• Sipp: SIP performance tester
• Sipsak: SIP testing tool
• Vovida.org load balancer: SIP Load Balancer
• PROTOS Test-Suite: SIP Testing tools
• SFTF: SIP Forum Test Framework - a SIP UA test suite primarily targeted at UA software developers hosted by SIPfoundry

SIP Protocol Stacks and Libraries

• oSIP Library SIP Library
• eXosip - eXtended osip library
• Vovida SIP Vovida SIP stack
• reSIProcate SIP stack and sample Application from SIPfoundry
• NIST SIP Various SIP appications and tools in Java
• Twisted Python protocol stacks and applications includes SIP support
• OSP client protocol stack and SIPfoundry
• libdissipate SIP stack
• sipXtackLib an RFC 3261, 3263 complient SIP stack from SIPfoundry
• minisip includes a SIP stack

H.323 Clients

Linux clients:

• GnomeMeeting
• SJphone (free but not open)

MacOS X clients:

• SJphone (free but not open)

Windows clients:

• MS-Netmeeting (free but not open)
• SJphone (free but not open)

IAX clients

• iaxComm for Linux, MacOS X and Windows
• Firefly - for Windows only (free but not open)
• QtIax from http://www.holgerschurig.de/qtiax.html
  • still in development, but you can already phone
  • GPL, source code available
  • written in Qt 3.x with a modified (stripped down) libiax2
• SFLphone, open-source multiplatform multi-protocol VoIP client

RTP Proxies

• Portaone rtpproxy: Works with SIP express router to traverse NAT, also functions as RTP gateway between IPv4 and IPv6
• AG Projects: SER MediaProxy works with SIP express router, has load-balancing using DNS SRV records and accounting capabilities

RTP Protocol Stacks

• JRTPLIB c++ Object oriented RTP library
• UCL Common Multimedia Library inlcudes cross platform RTP stack
• oRTP Written in C, based on glib for unix and windows portability
• ccRTP C++ library based on GNU Common C++
• LIVE.COM Streaming Media includes C++ RTP stack
• Vovida RTP Stack
• RTPlib C library
• libRTP part of gnome-o-phone?
• sipXmediaLib RTP + audio bridges, audio splitters, echo supression, tone from generation (e.g. DTMF), streaming support, RTCP, G711 codecs, etc. from SIPfoundry
• Secure RTP - see: SRTP

Other tools

• Vovida.org STUN server: A STUN server
• Vomit converts a Cisco IP phone conversation (recorded with TCPdump) into a standard WAV file

PBX platforms

Some of these include SIP proxy functionality

• Asterisk: Open Source PBX. Supports IAX, SIP, MGCP, H.323 and other protocols
• OpenPBX: Open Source PBX with OH323 PSTNGW support
• PBX4Linux: ISDN PBX with H.323 GW
• sipX - The SIP PBX for Linux from SIPfoundry, sipX on freshmeat.net
• SIPexchange PBX Pingtel's SIP PBX
• YATE Yet Another Telephony Engine

IVR platforms

• Asterisk: Open Source PBX with built-in IVR server
• Bayonne: GNU project IVR server
• OpenVXI: Implementation of VoiceXML
• sipX PBX The SIP PBX for Linux (open source) with built-in IVR (voice mail & auto-attendant)
• See Also: VoiceXML
• YATE Yet Another Telephony Engine

Voicemail servers

• Asterisk: Open Source PBX with built-in Voicemail Server
• sipX PBX The SIP PBX for Linux (open source) with built-in IVR (voice mail & auto-attendant)
• Lintad: Linux Telephone Answering Device - A Voice and Faxmail Server
• OpenUMS: Linux Voicemail and Unified Messaging Server
• VOCP: A Voicemail Server for voice modems
• YATE Yet Another Telephony Engine

Speech

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

• Festival: Voice synthesis system (implemented with a trainable neural network)
• OpenSALT: Implementation of SALT
• OpenVXI: Implementation of VoiceXML
• Sphinx: speaker-independent speech recognizer

Fax Servers

• Lintad: Linux Telephone Answering Device - A Voice and Faxmail Server
• Hylafax
• Asterisk Fax Email Gateway

Development platforms, protocol stacks

• OpenSS7: SS7 Protocol Stack
• ooh323c: Open Source H.323 Protocol Stack Developed in C

Billing

• See Open Source Billing Systems

Codecs

• See Codec Software

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