Hello,

I have an issue with the fix_nated_contact() function. OpenSer is supposed to change Contact header, but it only changes it in the INVITE message, but not in the OK response. As a consequence, ACK messages contain sip:test@192.168.1.1:5060 and not the public ip. OpenSer doesn’t know how to handle that ACK and forward it to 192.168.1.1:5060.

The same issue occurs in CANCEL/487. Changes are done in CANCEL Contact header, but not in 487 reply. No problem for BYE, as OK response doesn’t need an ACK

I suppose I have something wrong in my cfg file, but I can’t find it out.

Regards,

Paul

Openser.Cfg:

...default loadmodules and modparam ...

# main routing logic

route{

      # initial sanity checks -- messages with

      # max_forwards==0, or excessively long requests

      if (!mf_process_maxfwd_header("10")) {

            sl_send_reply("483","Too Many Hops");

            exit;

      };

      if (msg:len >=  2048 ) {

            sl_send_reply("513", "Message too big");

            exit;

      };

      # we record-route all messages -- to make sure that

      # subsequent messages will go through our proxy; that's

      # particularly good if upstream and downstream entities

      # use different transport protocol

      if (!method=="REGISTER"){

            record_route();

            force_rport();

            fix_nated_register();

            fix_nated_contact();

      };

      #if(search("Contact")){

            #setflag(6);

            #force_rport();

            # fix_nated_contact();

      #};

      if(method!="REGISTER" && method!="ACK")

      {    

            #record everything besides registers and acks

            setflag(1);

            setflag(3);

      };

      # subsequent messages withing a dialog should take the

      # path determined by record-routing

      if (loose_route()) {

            # mark routing logic in request

            append_hf("P-hint: rr-enforced\r\n");

            route(1);

      };

      if (!uri==myself) {

            # mark routing logic in request

            append_hf("P-hint: outbound\r\n");

            # if you have some interdomain connections via TLS

            #if(uri=~"@tls_domain1.net") {

            #     t_relay_to_tls("IP_domain1","port_domain1");

            #     exit;

            #} else if(uri=~"@tls_domain2.net") {

            #     t_relay_to_tls("IP_domain2","port_domain2");

            #     exit;

            #}

            route(1);

      };

      # if the request is for other domain use UsrLoc

      # (in case, it does not work, use the following command

      # with proper names and addresses in it)

      if (uri==myself) {

            if (method=="REGISTER") {

                  #change contact field IP and port by those received really used after NAT rewritting by router   

                  #fix_nated_contact();

                  #force openSer to respond on the port from which the request has been sent insteed of the port

                  #in contact field.

                  force_rport();

                  # Uncomment this if you want to use digest authentication

                  if (!www_authorize("mydomain", "subscriber")) {

                        www_challenge("mydomain ", "0");

                        exit;

                  };

                  setflag(1);

                  setflag(3);

                  fix_nated_register();  

                  save("location");

exit;

            };

            lookup("aliases");

            if (!uri==myself) {

                  append_hf("P-hint: outbound alias\r\n");

                  route(1);

            };

            # native SIP destinations are handled using our USRLOC DB

            if (!lookup("location")) {

                  sl_send_reply("404", "Not Found");

                  exit;

            };

            append_hf("P-hint: usrloc applied\r\n");

      };

      route(1);

}

route[1] {

      # send it out now; use stateful forwarding as it works reliably

      # even for UDP2TCP

      if (!t_relay()) {

sl_reply_error();

      };

      exit;

}