I have implemented (at this moment, only in VMware) a small LAN (XP <-------> Cisco_router <-------> Fortigate <-------> XP) for an academic project.
Now I need a VoIP traffic generator tool (preferably free) to stress the Fortigate and make some QoS measurements. I have searched on Google, but I've found only SIPp  which is not what i need. I need to simulate a real VoIP emviromnet. Is there someone who knows such a tool.