private  IP                                               public IP                                                  public  IP                                          private IP

 

whatever A call B , or B call A , the call can setup , but after forwarding by SER

the SDP didn't modify correctly , all the same as client send

it should modify to Ser server's ip and port , but it seems not...

 

i think maybe is my ser.cfg has some mistake

could anyone give some idea where should i add or modify something ?

 

here is my ser.cfg which refered to (http://www.informatik.uni-bremen.de/~prelle/terena/cookbook/main/ch04s07.html)

 

regards

jimmy

 

============================================================================================

#
# $Id: ser.cfg,v 1.21.4.1 2003/11/10 15:35:15 andrei Exp $
#
# simple quick-start config script
#

 

# ----------- global configuration parameters ------------------------

 

#debug=3         # debug level (cmd line: -dddddddddd)
#fork=yes
#log_stderror=no # (cmd line: -E)

 

#/* Uncomment these lines to enter debugging mode
debug=7
#fork=no
log_stderror=yes
#*/

 

check_via=no # (cmd. line: -v)
dns=no           # (cmd. line: -r)
rev_dns=no      # (cmd. line: -R)
#port=5060
#children=4
fifo="/tmp/ser_fifo"

 

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

 

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

 

loadmodule "/usr/local/lib/ser/modules/sl.so"
loadmodule "/usr/local/lib/ser/modules/tm.so"
loadmodule "/usr/local/lib/ser/modules/rr.so"
loadmodule "/usr/local/lib/ser/modules/maxfwd.so"
loadmodule "/usr/local/lib/ser/modules/usrloc.so"
loadmodule "/usr/local/lib/ser/modules/registrar.so"
#++++++++++    jimmy added      ++++++++++++++++++
loadmodule "/usr/local/lib/ser/modules/textops.so"
loadmodule "/usr/local/lib/ser/modules/nathelper.so"
#----------------------------------------------------
# Uncomment this if you want digest authentication
# mysql.so must be loaded !
#loadmodule "/usr/local/lib/ser/modules/auth.so"
#loadmodule "/usr/local/lib/ser/modules/auth_db.so"

 

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

 

#++++++++++    jimmy added      ++++++++++++++++++
#we will you flag 6 to mark NATed contacts
modparam("registrar","nat_flag",6)
#Enable NAT pinging
modparam("nathelper","natping_interval",3)
#ping only contacts that are known to be behind NAT
modparam("nathelper","ping_nated_only",1)
#----------------------------------------------------

 

# -- 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)

 

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

 

# main routing logic

 

route{

 

#++++++++++    jimmy added      ++++++++++++++++++
 if(nat_uac_test("3"))
 {
  if((method == "REGISTER") || !(search("^Record-Route:")))
  {
   log("LOG:Someone trying to register from private IP, rewriting\n");
  
   fix_nated_contact();
   if(method == "INVITE")
   {
        fix_nated_sdp("3");
   };
   force_rport();
   setflag(6);
  };
 };
#----------------------------------------------------

 

 # 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;
 };

 

 # 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
 record_route(); 
 # loose-route processing
 if (loose_route()) {
  t_relay();
  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;
  };

 

  # native SIP destinations are handled using our USRLOC DB
  if (!lookup("location")) {
   sl_send_reply("404", "Not Found");
   break;
  };
 };
 # forward to current uri now; use stateful forwarding; that
 # works reliably even if we forward from TCP to UDP
 if (!t_relay()) {
  sl_reply_error();
 };

 

}

 

#++++++++++    jimmy added      +++++++++++++++++++++
route[1]
{
 if(uri=~"[@:](192\.168\.|10\.|172\.16)" && !search("^Route:"))
 {
  sl_send_reply("479","we don't forward to private IP address");
  break;
 };
 if(isflagset(6))
 {
  force_rtp_proxy();
  t_on_reply("1");
  append_hf("P-Behind-NAT: Yes\r\n");
 }
 
 if(!t_relay())
 {
  sl_reply_error();
  break;
 }
}

 

onreply_route[1]
{
 if(status =~ "(183)|2[0-9][0-9]")
 {
  fix_nated_contact();
  force_rtp_proxy();
 };
}
#----------------------------------------------------