[Serusers] how to let the SER through NAT

Hello, I have problem about NAT , Sould I install the Rtpproxy with SER? ( I only put the Nathelper in the SER) I installed the SER in the a publib ip, other endpoints in private ip . I want to let the endpoints transfers voice . But I failed when I step the Nathelper's readme . Can it transfer voice when only use Nathelper ?The config following : # debugging mode debug=3 fork=no log_stderror=yes # ------------------ module loading ---------------------------------- loadmodule "modules/nathelper/nathelper.so" loadmodule "modules/textops/textops.so" loadmodule "modules/tm/tm.so" loadmodule "modules/rr/rr.so" loadmodule "modules/registrar/registrar.so" loadmodule "modules/usrloc/usrloc.so" loadmodule "modules/sl/sl.so" # ------------------ request-routing script -------------------------- # main routing logic route{ # compulsory processing of Route header fields and adding RR loose_route(); # ATA's are symmetric but don't advertise it -- force use of rport if (search("User-Agent: Cisco ATA.*")) { setflag(1); # remember this is ATA force_rport(); fix_nated_contact(); }; /* registration (uses rewritten contacts) */ if (method=="REGISTER") { save("foo.bar.com"); break; }; if (method=="INVITE") { record_route(); if (isflagset(1)) { # ATA ? force_rtp_proxy(); }; /* set up reply processing */ t_on_reply("1"); }; /* set up reply processing and forward statefuly */ t_relay(); } # all incoming replies for t_onrepli-ed transactions enter here onreply_route[1] { if (status=~"2[0-9][0-9]" && search("Server: Cisco ATA.*")) fix_nated_contact(); force_rtp_proxy(); } _________________________________________________________________ Don't just search. Find. Check out the new MSN Search! http://search.msn.com/