SIP and RTP Stack

Note: I only searched for C/C++ stacks and applications. There also exist a lot of stacks and applications for other programming languages, especially for java. If you are looking for Java stacks/applications, please ask Google. If you have any comments or interesting links, or do you want to report broken links, please contact me 

RTP Stacks (mainly open source C/C++ stacks)

• jrtplib: C++; License: Free; Homepage: http://lumumba.luc.ac.be/jori/jrtplib/jrtplib.html
• Common Multimedia Library: from UCL London, includes RTP stack; C; License: Free; Homepage: http://www-mice.cs.ucl.ac.uk/multimedia/software/common/
• ortp: C; License: LGPL; Homepage: http://www.linphone.org/ortp/; without RTCP, from linphone
• GNU ccRTP: C++; License: GPL (with linking exception); Homepage: http://www.gnu.org/software/ccrtp/
• LIVE.COM Streaming Media: C++; License: LGPL; Homepage:  http://live.com/liveMedia/
• Morgan RTP DirectShow Filters: C++; License: ?; Homepage: http://www.morgan-multimedia.com/RTP/; based on liveMedia library
• RTP from vovida.org: C++; License: Free; Homepage:  http://www.vovida.org/protocols/downloads/rtp/
• RTPlib: RTP library from Lucent Technologies/Cloumbia University; C; License: Non-exklusive source code license; Homepage: http://www-out.bell-labs.com/project/RTPlib/
• librtp: C; License: GPL; Homepage: http://gphone.sourceforge.net/template.php3?page=librtp; from Gnome-o-phone

SIP Stacks

• dissipate: C++; License: GPL; Homepage: http://www.div8.net/dissipate/; The original dissipate by Billy Biggs.
• dissipate2: C++; License: GPL; Homepage: http://www.wirlab.net/kphone/; A enhanced dissipate, is part of the kphone distribution.
• GNU osip; C; License: LGPL; Homepage: http://www.gnu.org/software/osip/; Also known as libosip. Note: The interface of osip has been changed and from now on it will be called osip2!
• GNU eXosip; C; License: GPL; Homepage: http://savannah.nongnu.org/projects/exosip/; The extensible osip: "...It aims to implement a simple high layer API to control the SIP for sessions establishements and common extensions. Once completed, this eXtended library should provide an API for call management, messaging and presence features....
• SIP from vovida.org: C++; License: Vovida Software License; Homepage: http://www.vovida.org/protocols/downloads/sip/

RTP Applications

• RAT - Robust Audio Tool; Supports a large number of codecs, ... License: Free; Homepage: http://www-mice.cs.ucl.ac.uk/multimedia/software/rat/
• JMF - Java Media Framework: Can receive and send RTP streams; Homepage: http://java.sun.com/products/java-media/jmf/
• MP3/RTP Plugin for Winamp: Homepage: http://www.live.com/multikit/winamp-plugin.html
• Vomit - Voice over Missconfigured Internet Telephones: Plays back captured voice conversation; Homepage: http://vomit.xtdnet.nl
• RTP Tools: Several RTP utilities from the Columbia University; Homepage: http://www.cs.columbia.edu/IRT/software/rtptools/
• UDP Packet Reflector/Forwarder: A tiny tool which forwards or reflects UDP packets. You can also add delay and packet loss. Very useful if you want to test RTP applications. Homepage: http://www.cs.ucl.ac.uk/staff/s.bhatti/teaching/z02/reflector.html. As I was not able to compile this tool I searched and found a binary somewhere in the web. You can download it local

SIP Phone (User Agent, Softphone, Proxy)

• Ubiquity User Agent: Java based SIP Client for Windows, very useful, you have to register (free) to get an license; Homepage: http://www.ubiquity.net/useragent.php
• Linphone: A SIP Softphone for Linux (GNOME), needs libosip ans oRTP; Homepage: http://www.linphone.org/
• KPhone: A SIP Softphone for Linux (KDE); Homepage: http://www.wirlab.net/kphone/index.html
• Vovida: Complete SIP Suite for Linux (Uaser Agent, Proxy, ...), very, very big software contruct; Homepage: Vovida.org
• Siphon: Linux SIP Softphone; Homepage: http://siphon.sourceforge.net/index.html
• AVAZ SIP Phone: Cool looking SIP Phone for Windows, crashes very often at my PC, but works well on my friends PC; Homepage:http://www.avaz.com/products/software/sip/index.html
• EZ-Phone (Evaluation Version): SIP Phone for Windows; Homepage: http://www.hssworld.com/voip/download.htm
• MySIP: SIP User Agent from Siemens; Homepage: http://www.mysip.ch/
• MSN Messenger: Microsofts Messenger, Version 4.6 allows also connections to other SIP servers than microsofts one. Nice design, works very well. Can be used with the SIP service of iptel.org. Homepage: http://messenger.microsoft.com; local download of Version 4.6 for Windows NT (2000).
• MSN Messenger: Microsofts Messenger, Version 4.7 allows also connections to other SIP servers than microsofts one. Nice design, works very well. Can be used with the SIP service of iptel.org. Homepage: http://messenger.microsoft.com; local download of Version 4.7 for Windows XP.
• SJPhone: SIP and H.323 Softphone for Windows, Linux and PocketPC from: http://www.sjlabs.com/. The configuration for SIP is a little bit tweaky. And there must not be another SIP client running on port 5060 or the SJPhone won't work.
• instant xpressa: The software version of the xpressa SIP phone from pingtel: http://www.pingtel.com/appdev.jsp; A really impressive SIP phone with a lot of features. Can be extended with Java programs, but no free version available.
• xphone: A SIP client for Windows and Windows CE, http://xphone.xten.net/. The beta version is free.
• SIPPS: SIP softphone with answering machine and a lot of features, but, IMHO, a not very intuitive user interface, which should be better in the next version (try it yourself).http://www.sippstar.com/. A Demo for testing is available.

SIP Test Utility

• sipsak: SIP Swiss Army Knife, very useful test utility (Linux); Homepage: http://sipsak.berlios.de/
• SIPNess: Ortena Networks SIP Messenger, very useful test utility for windows; Homepage: http://www.ortena.com/download.htm

SIP Applications (Proxy, Location Server)

• Sip Express Router (ser): Highspeed GNU SIP proxy with a lot of features and a lot of ongoing development. Homepage: http://www.iptel.org/ser/. A really cool SIP proxy - I like it! You can also take a look at the development homepage.
• Asterisk: Linux Software PBX with Gateway, SIP Proxy, Gateway (SIP, H.323, PSTN, ...); Homepage: http://www.asteriskpbx.com/

Commercial SIP Stacks

• Juphoon SIP; C; High Performance SIP stack, Homepage: http://www.juphoon.com/en/products/protocols_voip/sip.htm
• SIP Phone (User Agent, Softphone, Proxy)
• JPhone: Juphoon Phone Framework, Juphoon provides voip phone, video phone, 3G IMS PoC, IMS UE soultion. http://www.juphoon.com/en/solutions/solutions.htm