[OpenSIPS-Users] rtpproxy from external to internal network

[Ghaith ALKAYYEM]

Hello,

I'm trying to test rtpproxy with nathelper module to forward RTP traffic
between two networks, my architecture is as follow:


        

-------------------        --------------------------------------
--------------------
UAC (172.23.1.22) |        |                                    |
| UAC (172.1.1.21) |
                  |=======>| 172.23.1.20 (OpenSIPS) 172.1.1.166 |
=======>|                  |
Internal Network  |        |                                    |
| External Network |
-------------------        --------------------------------------
--------------------

                



I run rtpproxy:
rtpproxy -fF -l 172.1.1.166/172.23.1.20
Then I tried to establish a call from internal net (172.23.1.22) to
external net(172.1.1.21) and the connection established succussfully
with perfect RTP relay through (172.1.1.166) interface.

But when I tried to call from external network towards internal, the RTP
traffic relay didn't work?.

Following is the part related to nathelper and routing logic in my
configuration file:



loadmodule "nathelper.so"

modparam("nathelper", "natping_interval", 30)
modparam("nathelper", "ping_nated_only", 1)
modparam("nathelper", "rtpproxy_sock", "unix:/var/run/rtpproxy.sock")
modparam("nathelper", "received_avp", "$avp(i:42)")
modparam("registrar", "received_avp", "$avp(i:42)")

modparam("usrloc", "nat_bflag", 6)

modparam("registrar", "method_filtering", 1)

mhomed=1

route {

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

  if (msg:len > max_len) {
    sl_send_reply("513", "Message Overflow");
    #break;
    return();
  };

  # -----------------------------------------------------------------
  # Record Route Section
  # -----------------------------------------------------------------
  if (method!="REGISTER") {
    record_route();
  };

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

  # -----------------------------------------------------------------
  # Loose Route Section
  # -----------------------------------------------------------------

  if (loose_route()) {

    if ((method=="INVITE" || method=="REFER") && !has_totag()) {
      sl_send_reply("403", "Forbidden");
      #break;
    return();
    };

    if (method=="INVITE") {

      #if (!proxy_authorize("","subscriber")) {
      #  proxy_challenge("","0");
      #  break;
      #} else if (!check_from()) {
      #  sl_send_reply("403", "Use From=ID");
      #  break;
      #};

      #consume_credentials();

      if (nat_uac_test("19")) {
        setflag(6);
        force_rport();
        fix_nated_contact();
      };
      force_rtp_proxy("l");
    };

    route(1);
    #break;
    return();
  };


  # -----------------------------------------------------------------
  # Call Type Processing Section
  # -----------------------------------------------------------------
  if (uri!=myself) {
    route(4);
    route(1);
    #break;
    return();
  };

  if (method=="ACK") {
    route(1);
    #break;
    return();
  } if (method=="CANCEL") {
    route(1);
    #break;
    return();
  } else if (method=="INVITE") {
    route(3);
    #break;
    return();
  } else  if (method=="REGISTER") {
    route(2);
    #break;
    return();
  };

  lookup("aliases");
  if (uri!=myself) {
    route(4);
    route(1);
    #break;
    return();

  };

  if (!lookup("location")) {
    sl_send_reply("404", "User Not Found");
    #break;
    return();
  };

  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");

  #if (!www_authorize("","subscriber")) {
  #  www_challenge("","0");
  #  break;
  #};

  #if (!check_to()) {
  #  sl_send_reply("401", "Unauthorized");
  #  break;
  #};

  #   consume_credentials();

  if (!save("location")) {
    sl_reply_error();
  };
}

route[3] {

  # -----------------------------------------------------------------
  # INVITE Message Handler
  # -----------------------------------------------------------------

  #if (!proxy_authorize("","subscriber")) {
  #  proxy_challenge("","0");
  #  break;
  #} else if (!check_from()) {
  #  sl_send_reply("403", "Use From=ID");
  #  break;
  #};

  #   consume_credentials();

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

  lookup("aliases");
  if (uri!=myself) {
    route(4);
    route(1);
    #break;
    return();
  };

  if (!lookup("location")) {
    sl_send_reply("404", "User Not Found");
    #break;
    return();
  };

  route(4);
  route(1);
}

route[4] {

  # -----------------------------------------------------------------
  # NAT Traversal Section
  # -----------------------------------------------------------------

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


onreply_route[1] {

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

  if (nat_uac_test("1")) {
    fix_nated_contact();
  };
}#end of route.

branch_route[2] {
        xlog("new branch at $ru\n");
}


onreply_route[2] {
        xlog("incoming reply\n");
}


failure_route[1] {
        if (t_was_cancelled()) {
                exit;
        }

        # uncomment the following lines if you want to block client
        # redirect based on 3xx replies.
        ##if (t_check_status("3[0-9][0-9]")) {
        ##t_reply("404","Not found");
        ##      exit;
        ##}


        # uncomment the following lines if you want to redirect the
failed
        # calls to a different new destination
        ##if (t_check_status("486|408")) {
        ##      sethostport("192.168.2.100:5060");
        ##      # do not set the missed call flag again
        ##      t_relay();
        ##}
}



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