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!