[Serusers] Rtpproxy - sr-users

24 Feb 2004

    # 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
    if (nat_uac_test("3")){
            if (method == "REGISTER"){
                    log("LOG:Someone trying to register from private IP, rewriting\n");
                    fix_nated_contact(); # Rewtite contact with source IP of signalling
                    if(method== "INVITE"){
                            fix_nated_sdp("1"); # Add direction-active to SDP
                    };
                    force_rport();
                    setflag(6);
            };
    };

    # 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") {
                    save("location");
                    break;
            };

            # native SIP destinations are handled using our USRLOC DB
            if (!lookup("location")) {
                    sl_send_reply("", "Connecting");
                    break;
            };
    };
    if (isflagset(6)){
            force_rtp_proxy();
    };
    t_on_reply("1");

    # 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();
            break;
    };