Testing Asterisk in thw network

I would like to test the network where Asterisk is running simulating with a traffig generator.

I wanna to know the limit of maximun call how Asterisk can manage, and test some voip calling with internet traffics in the same network.

Any idea which traffic generator or other kind of software is the best and without license?

Thank at everybody.

only one i know of:


if anyone has any other load testers, please post - this has been on my project list for quite some time.