[Serusers] NAT and ser

[Greger V. Teigre]

Serhan,
You have left out many different commands that are needed for NATing (hint: 
fix_nated_contact()). Have a look at the Getting Started document at 
http://onsip.org/ and the example config files.
g-)

----- Original Message ----- 
From: "Serhan Sevim" <sevims at mezun.com>
To: <serusers at lists.iptel.org>
Sent: Monday, April 18, 2005 10:44 PM
Subject: [Serusers] NAT and ser


> Hello there,
> we use ser to forward incoming call requests to a remote PSTN.
> this system works fine if the client has a non-natted public IP
> address.However, I can't tell the same thing for the natted clients and
> it doesn't work so far.
> using nathelper/rtpproxy, the client (x-lite) can make the connection
> and ring the phone but picking up the phone on the other end.. hmm,
> well, no audio can be heard.
> As a matter of fact, x-lite client times out with error 408 "after" I
> hear the remote phone rings. it seems like the client side simply
> signaling for connection but no data(audio) transfer can be made.
> below is my ser.cfg, does anybody have an idea?
> Thanks in advance.
> Serhan.
>
>
>
> # ----------- global configuration parameters ------------------------
>
> #debug=7        # debug level (cmd line: -dddddddddd)
> #fork=yes
> #log_stderror=yes       # (cmd line: -E)
>
> # Uncomment these lines to enter debugging mode
> #debug=7
> #fork=yes
> #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 ----------------------------------
>
>
> loadmodule "/usr/local/lib/ser/modules/mysql.so"
> loadmodule "/usr/local/lib/ser/modules/nathelper.so"
> loadmodule "/usr/local/lib/ser/modules/textops.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"
> loadmodule "/usr/local/lib/ser/modules/xlog.so"
>
> #Database URL is here!
> modparam("usrloc", "db_url", "sql://ser:pass123@localhost/ser")
>
> #nathelper params.
> modparam("registrar", "nat_flag", 6)
> modparam("nathelper", "natping_interval", 30)   # Ping interval 30 seconds
> modparam("nathelper", "ping_nated_only", 1)     # Ping only clients
> behind NAT
>
> #mysql
> loadmodule "/usr/local/lib/ser/modules/auth.so"
> loadmodule "/usr/local/lib/ser/modules/auth_db.so"
>
> # ----------------- setting module-specific parameters ---------------
>
> #modparam("usrloc", "db_mode",   0)
> modparam("usrloc", "db_mode", 2)
> modparam("auth_db", "calculate_ha1", yes)
> modparam("auth_db", "password_column", "password")
> modparam("rr", "enable_full_lr", 1)
>
> # -------------------------  request routing logic -------------------
>
> # main routing logic
>
> alias="domain.com"
> alias="sipgw.domain.com"
>
> 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;
>        };
>
>        # for testing purposes, simply okay all REGISTERs
>        if (method=="REGISTER") {
>                log(1, "REGISTER received\n");
>        } else {
>                log(1, "non-REGISTER received\n");
>        };
>        if (uri=~"sip:.*[@:]sipgw.domain.com") {
>                log(1, "request for sipgw.domain.com received\n");
>        } else {
>                log(1, "request for other domain received\n");
>        };
>
>
>
>        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 entitie
>        # use different transport protocol
>        record_route();
>        # loose-route processing
>        if (loose_route()) {
>                t_relay();
>                break;
>        };
>
>
> # PSTN Forwarding
>        if (uri=~"^sip:1")
>        {
>                strip(1);
>           #    forward(pstngw.jondoe.com,5060);
>                force_rtp_proxy();
>                t_relay_to_udp("pstngw.jondoe.com", "5060");
>                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") {
>                        save("location");
>                        break;
>                };
>
>                # native SIP destinations are handled using our USRLOC DB
>                if (!lookup("location")) {
>                        sl_send_reply("404", "not exists!");
>                        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();
>        };
>
> }
>
>
>
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