[Serusers] NAT problems with media proxy

Hi there, I have got some problems setting up ser to work with media proxy . I've set up the SER in a public domain (using a public IP address) and want to use the media proxy (http://www.ag-projects.com/MediaProxy.html) for the ocassion. when I tried to reproduce the example configuration in the SER source code, it generates an error saying "client_nat_test()" command not found. I tried to locate the source code of mediaproxy.c in the SER sources, but found the is ClientNatTest() function instead. Well, I am actually just looking for some solutions which makes NAT traversal for SIP and RTP work. Does anyone has a worked solution ?? thanks Proson