Sipana is a distributed SIP monitoring tool to monitor the SIP signaling behavior using sequence diagrams and providing SIP end-to-end performance metrics through a centralized Web interface. For more information please visit http://sipana.org/
The RTP Monitor discovers RTP flows, used by Internet phone applications, and monitors their QoS metrics, observing the interference caused by traffic congestion. It uses distributed collecting agents and provides feedback about the quality in the calls.
SIPStir is a bulk call generator for SIP devices/servers. The server piece is capable of generating an infinite variety of call scenarios based on a simple scripting language. A wxPython client can connect to the server to monitor and modify progress.
H.323 Beacon is a tool that can be used to measure/monitor/qualify/troubleshoot performance of H.323 Videoconference sessions both at the network and at the host by using a end-node(client) and core-node(server) architecture.