# sipsak: 
SIP Swiss Army Knife, very useful test utility (Linux);
http://sipsak.org/

# SIPp: 
a powerful SIP performance testing tool sponsered by HP;
http://sipp.sourceforge.net/.

# PROTOS Test-Suite: c07-sip: 
This is a java based tool, which tests SIP 
clients by sending badly formated SIP messages. Thus, you can find bugs 
in the string processing functions of your SIP 
client.
http://www.ee.oulu.fi/research/ouspg/protos/testing/c07/sip/.

# SIPNess: Ortena Networks SIP Messenger
very useful test utility for windows; 
http://www.ortena.com/download.htm

# Nastysip
A simple Linux-program from SX-Design that generates bogus 
SIP-messages and sends them to any peer. Download at (broken) 
http://phoenix.labri.fr/documentation/sip/Documentation/Material/Clients/Tools/Test/NastySIP/SX%20Design.htm.

# SIP Forum Test Framework (SFTF)
A Framework to test SIP devices for common errors.
sipfoundry.org.

# callflow: a powerful SIP call flow visualizer; 
http://callflow.sourceforge.net/

# SIP Scenario Generator
A powerful SIP call flow visualizer
http://www.iptel.org/~sipsc/

# VoIPong
Sniffs the network, detects RTP streams and write them into 
wav files. Currently only supports G.711. 
http://www.enderunix.org/voipong/

# SiVuS
A Windows based VoIP Vulnerability Scanner.
http://vopsecurity.org/html/tools.html.

# WIST
WIST stands for Web Interface for SIP Trace. It allows remote 
capturing and nice graphical representation in a browser window. 
http://www.devel-it.org/index.php?modulo=projetos&id=2.

# SIPANAlyzer
Allows remote SIP capture and DB storage, and viewing in 
a web browser. 
http://ant.comm.ccu.edu.tw/sip/

# SIPv6 Analyzer
A frontend for ethereal and other tools to capture 
VoIP traffic (local or remote) and display it in a nice way. Supports 
also playback of RTP streams. 
http://pcs.csie.nctu.edu.tw/~yhsung/sipv6_analyzer/.

# SIP Testing Prototype Eclipse Plugin
An Eclipse plugin which allows 
you to create test call flows with drag and drop. Free, but registration 
is necessary. 
https://developer.ubiquitysoftware.com/downloads/unsupported-code.

# pjsip-perf, siptrp
Tools to generate high loads of calls (UDP+TCP) 
and simple call answer application. They are part of the pjproject 
SIP+RTP suite.
http://www.pjsip.org/
http://www.pjsip.org/release/0.5.8/