######## NAT Traversal module - signaling functions ########
#!ifndef NATHELPER_LOADED
loadmodule "nathelper.so"
#!trydef NATHELPER_LOADED
#!endif
modparam("nathelper", "received_avp", "$avp(AVP_RECV_PARAM)")
modparam("nathelper", "sipping_from", "sip:sipcheck@MY_HOSTNAME")

#!trydef KZ_NAT_DETECT    "19"

####### NAT Traversal Logic ########
route[NAT_INITIAL_TEST]
{
   if(nat_uac_test(64)) return();

   if(!is_method("INVITE|REGISTER|SUBSCRIBE")) return();

   if ($Rp == "5080") {
       setflag(FLAG_SKIP_NAT_CORRECTION);
   } else {
       if (is_present_hf("Record-Route")) {
           $var(i) = 0;
           $var(rr_count) = $rr_count;
           while($var(i) < $var(rr_count)) {
               $var(rr_base) = $(hdr(Record-Route)[$var(i)]);
               $var(rr_idx) = 0;
               $var(rr) = $(var(rr_base){s.select,$var(rr_idx),,});
               while($var(rr) != $null && $var(rr) != "") {
                   $var(i) = $var(i) + 1;
                   if (!is_myself("$(var(rr){nameaddr.uri})")) {
                       setflag(FLAG_SKIP_NAT_CORRECTION);
                       xlog("L_DEBUG", "$ci|log|skipping nat correction on record-route $(var(rr){nameaddr.uri})\n");
                   }
                   $var(rr_idx) = $var(rr_idx) + 1;
                   $var(rr) = $(var(rr_base){s.select,$var(rr_idx),,});
               }
           }
       }
   }

   if (isflagset(FLAG_SKIP_NAT_CORRECTION)) {
       return();
   }

   if(nat_uac_test(KZ_NAT_DETECT)) {
      force_rport();
      setflag(FLAG_NAT);
      if (!is_method("REGISTER")) {
          if(is_first_hop()) set_contact_alias();
      }
   }
   
   if (has_body("application/sdp") && nat_uac_test("8")) {
       fix_nated_sdp("10");
   }
   
}

route[NAT_REPLY_TEST] 
{
   if(nat_uac_test(64)) return();

   if(nat_uac_test(KZ_NAT_DETECT)) {
      setflag(FLAG_NAT);
      force_rport();
      set_contact_alias();
   }
   
   if (has_body("application/sdp") && nat_uac_test("8")) {
       fix_nated_sdp("10");
   }
   
}

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