loadmodule "/home/ser-0.9.3/modules/sl/sl.so"
loadmodule "/home/ser-0.9.3/modules/tm/tm.so"
loadmodule "/home/ser-0.9.3/modules/rr/rr.so"
loadmodule "/home/ser-0.9.3/modules/maxfwd/maxfwd.so"
loadmodule "/home/ser-0.9.3/modules/usrloc/usrloc.so"
loadmodule "/home/ser-0.9.3/modules/textops/textops.so"
loadmodule "/home/ser-0.9.3/modules/nathelper/nathelper.so"
loadmodule "/home/ser-0.9.3/modules/uri/uri.so"

 

# ----------------- setting module-specific parameters ---------------

 

# -- usrloc params --

 

modparam("usrloc", "db_mode",   0)

 

modparam("nathelper", "natping_interval", 30) # Ping interval 30 s
modparam("nathelper", "ping_nated_only", 1)   # Ping only clients behind NAT
modparam("nathelper", "rtpproxy_sock", "/var/run/rtpproxy.sock")

 

modparam("rr", "enable_full_lr", 1)

 

# -------------------------  request routing logic -------------------

 

route{

 

        # -----------------------------------------------------------------
        # Sanity Check Section
        # -----------------------------------------------------------------
        if (!mf_process_maxfwd_header("10")) {
                sl_send_reply("483", "Too Many Hops");
                break;
        };

 

        if (msg:len > max_len) {
                sl_send_reply("513", "Message Overflow");
                break;
        };
        #---------------
  if (method == "REGISTER" || ! search("^Record-Route:"))
   {
   append_hf("Alex-hint: NAThelper\r\n");
   fix_nated_register();
   fix_nated_contact();

 

      if (method == "INVITE")
      {
       append_hf("Alex-hint: SDP rewritten\r\n");
       force_rtp_proxy();
         };
   force_rport();   
   setflag(6);
         };
        #---------------
        # -----------------------------------------------------------------
        # Record Route Section
        # -----------------------------------------------------------------
  if(method != "REGISTER")
  {
   record_route();
  };

 

        if (method=="BYE" || method=="CANCEL") {
                unforce_rtp_proxy();
        }

 

        # -----------------------------------------------------------------
        # Loose Route Section
        # -----------------------------------------------------------------
        if (loose_route()) {

 

                if (has_totag() && (method=="INVITE" || method=="ACK")) {
                        if (nat_uac_test("19")) {
                                setflag(6);
                                force_rport();
                        };
                    force_rtp_proxy("l");
                };
    append_hf("Alex-hint: Loose Route\r\n");

 

                route(1);
                break;
        };

 

        # -----------------------------------------------------------------
        # Call Type Processing Section
        # -----------------------------------------------------------------

 

        if (uri!=myself) {
                route(1);
                break;
        };

 

        if (uri==myself) {

 

                if (method=="CANCEL") {
                        route(3);
                        break;
                } else if (method=="INVITE") {
                        route(3);
                        break;
                } else  if (method=="REGISTER") {
                        route(2);
                        break;
                };

 

                if (uri!=myself) {
                        route(1);
                        break;
                };
        };

 

        route(1);
}

 

route[1] {

 

        # -----------------------------------------------------------------
        # Default Message Handler
        # -----------------------------------------------------------------

 

        t_on_reply("1");

 

        if (!t_relay()) {
                if (method=="INVITE" && isflagset(6)) {
                  unforce_rtp_proxy();
                };
                sl_reply_error();
        };
}

 

route[2] {

 

        # -----------------------------------------------------------------
        # REGISTER Message Handler
        # ----------------------------------------------------------------

 

        if (!search("^Contact:\ +\*") && nat_uac_test("19")) {
                setflag(6);
                fix_nated_register();
                force_rport();
        };

 

        sl_send_reply("100", "Trying");
}

 

route[3] {

 

        # -----------------------------------------------------------------
        # CANCEL and INVITE Message Handler
        # -----------------------------------------------------------------

 

        if (nat_uac_test("19")) {
                setflag(6);
        };

 

        if (uri!=myself) {
                route(1);
                break;
        };

 

        if (isflagset(6)) {
                force_rport();
                #fix_nated_contact();
                force_rtp_proxy();
        };

 

        t_on_reply("1");

 

        if (!t_relay()) {
                if(isflagset(6)) {
                        unforce_rtp_proxy();
                }
                sl_reply_error();
        };
}

 

onreply_route[1] {

 

 if (isflagset(6) || status=~"(180)|(183)|2[0-9][0-9]") {
  if (!search("^Content-Length:\ +0")) {
   force_rtp_proxy();