hello
How to configure openser to force rtp proxy if one or two client are behind NAT but ignore if they have the same external ip.






my configure is

#-----------------------------------------------------------

debug=3         # debug level (cmd line: -dddddddddd)
fork=yes
log_stderror=yes        # (cmd line: -E)

/* Uncomment these lines to enter debugging mode
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/openser/modules/mysql.so"

loadmodule "/usr/local/lib/openser/modules/sl.so"
loadmodule "/usr/local/lib/openser/modules/tm.so"
loadmodule "/usr/local/lib/openser/modules/rr.so"
loadmodule "/usr/local/lib/openser/modules/maxfwd.so"
loadmodule "/usr/local/lib/openser/modules/usrloc.so"
loadmodule "/usr/local/lib/openser/modules/registrar.so"
loadmodule "/usr/local/lib/openser/modules/textops.so"
loadmodule "/usr/local/lib/openser/modules/uri_db.so"



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

# !! Nathelper
loadmodule "/usr/local/lib/openser/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")
modparam("auth_db", "db_url", "mysql://openser:[EMAIL PROTECTED]/openser")

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



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

# main routing logic


route {

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

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

               if (method=="INVITE") {

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

                       if (nat_uac_test("19")) {
                               setflag(6);
                               force_rport();
                               fix_nated_contact();
                       };
                       force_rtp_proxy("l");
               };
               route(1);
               return;
       };

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

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

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


       if (!lookup("location")) {
               sl_send_reply("404", "User Not Found");
               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("iptel.org","subscriber")) {
               www_challenge("iptel.org","0");
               return;
       };

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

       consume_credentials();

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

route[3] {

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

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

       consume_credentials();

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

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

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



thanks
Piter

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