[Serusers] [NAT] How to force both local client to make call not via rtpproxy ?

[jimmy huang]

Hi all,
I am trying ser + rtpproxy like this


                                                                     Internet       UA3
                                                                          |              |
                                                 ------------------------------------
                                                 |    NAT + ser + rtpproxy       |
                                                 ------------------------------------
                                                          |               |                Intranet
                                                        UA1          UA2

Now UA3 <-> UA1   , UA1 <-> UA2 can make call successfuly via rtpproxy in bridge mode
but now when UA1 <-> UA2 , i want the call can be made not via rtpproxy ,
I think it should do some modification in ser.cfg to make this,
I have try  some modification, but it doesn't works

could anyone give me any suggestion?

this is my ser.cfg


#debug=4         # debug level (cmd line: -dddddddddd)
fork=yes
#log_stderror=yes # (cmd line: -E)



check_via=no # (cmd. line: -v)
dns=no           # (cmd. line: -r)
rev_dns=no      # (cmd. line: -R)
port=5060
children=1
fifo="/tmp/ser_fifo"

# ------------------ module loading ----------------------------------

# Uncomment this if you want to use SQL database
#loadmodule "/lib/ser/modules/mysql.so"

loadmodule "/lib/ser/modules/sl.so"
loadmodule "/lib/ser/modules/tm.so"
loadmodule "/lib/ser/modules/rr.so"
loadmodule "/lib/ser/modules/maxfwd.so"
loadmodule "/lib/ser/modules/usrloc.so"
loadmodule "/lib/ser/modules/registrar.so"
loadmodule "/lib/ser/modules/textops.so"

# Uncomment this if you want digest authentication
# mysql.so must be loaded !
#loadmodule "/lib/ser/modules/auth.so"
#loadmodule "/lib/ser/modules/auth_db.so"

# !! Nathelper
loadmodule "/lib/ser/modules/nathelper.so"

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

# -- usrloc params --

modparam("usrloc", "db_mode",   0)

# Uncomment this if you want to use SQL database 
# for persistent storage and comment the previous line
#modparam("usrloc", "db_mode", 2)

# -- auth params --
# Uncomment if you are using auth module
#
#modparam("auth_db", "calculate_ha1", yes)
#
# If you set "calculate_ha1" parameter to yes (which true in this config), 
# uncomment also the following parameter)
#
#modparam("auth_db", "password_column", "password")

# -- rr params --
# add value to ;lr param to make some broken UAs happy
modparam("rr", "enable_full_lr", 1)

# !! Nathelper
modparam("registrar", "nat_flag", 6)
modparam("nathelper", "natping_interval", 5) # Ping interval 30 s
modparam("nathelper", "ping_nated_only", 1)   # Ping only clients behind NAT

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

# 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");
  break;
 };
 if (msg:len >=  max_len ) {
  sl_send_reply("513", "Message too big");
  break;
 };

        # !! Nathelper
 # Special handling for NATed clients; first, NAT test is
 # executed: it looks for via!=received and RFC1918 addresses
 # in Contact (may fail if line-folding is used); also,
 # the received test should, if completed, should check all
 # vias for rpesence of received
 if (nat_uac_test("3")) {
  # Allow RR-ed requests, as these may indicate that
  # a NAT-enabled proxy takes care of it; unless it is
  # a REGISTER

  if (method == "REGISTER" || ! search("^Record-Route:")) {
      log("LOG: Someone trying to register from private IP, rewriting\n");
      # This will work only for user agents that support symmetric
      # communication. We tested quite many of them and majority is
      # smart enough to be symmetric. In some phones it takes a configuration
      # option. With Cisco 7960, it is called NAT_Enable=Yes, with kphone it is
      # called "symmetric media" and "symmetric signalling".

      fix_nated_contact(); # Rewrite contact with source IP of signalling
      if (method == "INVITE") 
      {
# jimmy added for test ++++++++++++++++++++++++++++++++
   if(src_ip=~"192.168.5.*")
   {
    ;
   }else{
# -----------------------------------------------------
          fix_nated_sdp("1"); # Add direction=active to SDP
    }
   
      };
      force_rport(); # Add rport parameter to topmost Via
      setflag(6);    # Mark as NATed
  };
 };

 # 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(); 

 # 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);
  break;
 };

 if (!uri==myself) {
  # mark routing logic in request
  append_hf("P-hint: outbound\r\n"); 
  route(1);
  break;
 };

 # 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") {

# Uncomment this if you want to use digest authentication
#   if (!www_authorize("iptel.org", "subscriber")) {
#    www_challenge("iptel.org", "0");
#    break;
#   };

   save("location");
   break;
  };

  lookup("aliases");
  if (!uri==myself) {
   append_hf("P-hint: outbound alias\r\n"); 
   route(1);
   break;
  };

  # native SIP destinations are handled using our USRLOC DB
  if (!lookup("location")) {
   sl_send_reply("404", "Not Found");
   break;
  };
 };
 append_hf("P-hint: usrloc applied\r\n"); 
 route(1);
}

route[1] 
{
 # !! Nathelper

 # if client or server know to be behind a NAT, enable relay
 if (isflagset(6)) {
# jimmy added for test ++++++++++++++++++++++++++++++++++++++++++++++
  if(search("^(Contact|m): .*@(192\.168\.)"))
  #if(src_ip=~"192.168.5.*")
  {
   ;
  }else{
# -------------------------------------------------------------------
     force_rtp_proxy();
  }
  
 };

 # NAT processing of replies; apply to all transactions (for example,
 # re-INVITEs from public to private UA are hard to identify as
 # NATed at the moment of request processing); look at replies
 t_on_reply("1");

 # send it out now; use stateful forwarding as it works reliably
 # even for UDP2TCP
 if (!t_relay()) {
  sl_reply_error();
 };
}

# !! Nathelper
onreply_route[1] {
    # NATed transaction ?
    if (isflagset(6) && status =~ "(183)|2[0-9][0-9]") {
# jimmy added for test ++++++++++++++++++++++++++++++++++++++++++++++
 if(src_ip=~"192.168.5.*")
 {
  ;
 }else
 {
        fix_nated_contact();
 }
 force_rtp_proxy();
# -------------------------------------------------------------------
    # otherwise, is it a transaction behind a NAT and we did not
    # know at time of request processing ? (RFC1918 contacts)
    } else if (nat_uac_test("1")) {
        fix_nated_contact();
    };
}



Thanks in advance
Jimmy
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