Product Name: CallGen323 (H.323 Call Generator)
Product URL: http://www.openh323.org/code.html
Vendor: Open Source
Supported Protocols: H.323
Platform: Any platform where you can compile the OpenH323 Library (Linux, Windows, FreeBSD, Solaris, etc.)
Description:

Operational Experience: It can make and receive an exact number of calls, adjust the delay between each batch of calls, set the number of batches to repeat. It is only producing signalling traffic (no audio data traffic). Support and development has now stopped and it requires special old version of OpenH323 library to compile. No dynamic configuration is possible; once the program is started the client is configured using the command line options. Overall Evaluation: Simple H.323 Call Generator. Highly customizable using a number of parameters. Really useful in case of testing environment where servers need to be tested under stress. Drawbacks are static configuration, no dynamic management and limited support.

Product Name: Sipsak
Product URL: http://sipsak.berlios.de/
Vendor: iptel.org
Supported Protocols: SIP
Platform: N/A
Description:

Free Diagnostic and Stress Utility. Sipsak is a simple utility that can be used to test various functions of a SIP server. It includes proxy, registrar, and digest authentication tests. It can also generate a load of SIP messages to stress a server.

Product Name: SIPStone
Product URL: http://www.sipstone.org
Vendor: Columbia University and Ubiquity
Supported Protocols: SIP
Platform: N/A
Description:

Currently, this is a draft about measuring SIP performance http://www.sipstone.com/. A measurement tool is available from Columbia University - see http://www.cs.columbia.edu/IRT/cinema/sipstone/ See SIPstone mailing list for a discussion.