Hi


  I am trying to setup SER with nathelper module and portaone proxy. All other messages are sent on the nated IP of both user agents, except final ACK. Which is sent on private IP of called party. Here is the sequence ....
I have also pasted my ser.cfg file

My ser is running on public IP and both user agents are behind firewall.



UA1                        SER                            UA2
    INVITE
===============>
                                                  INVITE
                                         ===============>


                                              TRYING
                                         <===============
                                                  Ringing
                                         <===============
        Ringing
<===============
                                                         OK
                                          <===============
        OK
<===============



      ACK
===============>

                                             ACK (sent on UA2's Private IP)
                                             ===============>











debug=7
fork=yes
log_stderror=yes
listen=some_public_ip
port=5060
check_via=no
dns=no
rev_dns=no
server_signature=no
sip_warning=no
fifo="/tmp/ser_fifo"

# ------------------ module loading ----------------------------------
loadmodule "/usr/local/lib/ser/modules/nathelper.so"
loadmodule "/usr/local/lib/ser/modules/sl.so"
loadmodule "/usr/local/lib/ser/modules/xlog.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"
loadmodule "/usr/local/lib/ser/modules/auth.so"
loadmodule "/usr/local/lib/ser/modules/exec.so"
loadmodule "/usr/local/lib/ser/modules/print.so"
loadmodule "/usr/local/lib/ser/modules/textops.so"
loadmodule "/usr/local/lib/ser/modules/avpops.so"
# ----------------- setting module-specific parameters ---------------
modparam("usrloc", "db_mode",   0)
modparam("rr", "enable_full_lr", 1)
modparam("nathelper","rtpproxy_sock", "udp:some_public_ip:port")
modparam("registrar", "nat_flag", 6)
modparam("nathelper", "natping_interval", 30)
modparam("nathelper", "ping_nated_only", 0)
modparam("tm", "fr_timer", 12)
modparam("tm", "fr_inv_timer", 30)
modparam("tm", "fr_inv_timer_avp", "inv_timeout")

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

route
{
    if(!mf_process_maxfwd_header("10"))
    {
        log(1, "too many hops\n");
        sl_send_reply("483","Too Many Hops");
        break;
    };

    if(msg:len >=  max_len )
    {
        log(1, "message too big\n");
        sl_send_reply("513", "Message too big");
        break;
    };

    if(loose_route())
    {
        t_relay();
        break;
    };

    if(uri==myself)
    {
        if(method=="REGISTER")
        {
            fix_nated_register();
            force_rport();
            if(!save("location"))
            {
                log(1, "* * * * * < < < could not save location > > > * * * * *\n");
                sl_reply_error();
            };            
            break;
        };

        if(method=="INVITE")
        {
            fix_nated_contact();
            record_route();
            if(!lookup("location"))
            {
                sl_send_reply("404", "subscriber is offline. Pls try later");
                break;
            }
            force_rport();
            force_rtp_proxy("l");
            fix_nated_sdp("1");
        }
    };
    
    if(!t_relay())
    {
        log(1, "relay error\n");
        sl_reply_error();
        break;
    };
}

---

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