UA(192.168.0.11) received 183,  find Record-Route(36.140.122.12)
then send ACK  to 36.140.122.12(Kamialio public ip)   not 192.168.0.2(kamailio internal ip),  so Kamailio can't receive ACK.

this is my config,192.168.0.11 -> Kamailio ->  Other SBC(public ip)
function ksr_request_route()
      if KSR.is_INVITE() then
            KSR.rr.record_route();
            KSR.nathelper.fix_nated_contact()
      end
end

This question has been bothering me for a long time,  help me