WIth the latest development head running on a Debian box, I am trying to originate calls using event socket. Not sure why, but not able to generate more than 700 calls at any given time. Roughly around 40 CPS. For the sake of testing and simplicity, I just put the whole originate command multiple times in a text file and looping around it with fs_cli to execute. Dialplan sends the call to a lua script which randomly answers the call run the echo application and terminate with random seconds, something like http://wiki.freeswitch.org/wiki/Fakecall_responder