Hi,list I have found a configure file which can make ser+rtpproxy to support NAT traversal.But I don't want to use mysql and auth or some other modules which are not concerned with nathelper.In another words,I just want to use nathelper module to realize NAT traversal as a full proxy.I did some changes on this configure file now it can be registered but still cannot realize transaction between two client:( Could sombody help me or tell me which parameter should be change! thankes! http://mianpi.blogchina.com/inc/nat-rtpproxy.3.05.cfg --------------------------------- DO YOU YAHOO!? 雅虎邮箱超强增值服务－2G超大空间、pop3收信、无限量邮件提醒