How to use TestServer application?

hi all, how to use TestServer applicaiton? http://www.voip-info.org/wiki/index.php?page=Asterisk+cmd+TestServer
in this example i cannot run because i have no zap channel. i only have iaxclient. anyone can help me how to use TestServer or TestClient apps?
Thanks in advance. BTW, how do you do stress-testing for asterisk? it seems no a usable tools for this. who can give a rough number about p4 512M PC’s IAX register numbers using rtcache? and how to do stress testing on conference using meetme? Tks very much.

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