[Serusers] Mediaproxy, problems in PSTN-to-SIP

[Lucas Aimaretto]

> > No, there is only traffic in the direction SIP->PSTN.
> > I'm not using the web interface, but instead the shell command 
> > session.py
> > 
> > This is what it shows ... ( for the case when I call from 
> > PSTN-to-SIP ) 
> >
> > 
> > Total traffic:  20.48kbps/0bps/0bps (in1/in2/out)
> > Session count:  1
> 
> I think you need to look into your ser.cfg; it looks to me 
> like you are proxying calls only when they originate from NAT 
> -> non-nat and not from non-natted endpoints -> NAT.

I know that, I could tell from when UA sends rtp traffic directly to the
Gateway instead of sending it to the proxy. Is there something in the
sip/sdp headers that tells the proxy from where to get the IP of my UA,
so to be able to proxy the call ? Or, in other words, Why should calls
coming in from the pstn not be proxied ?

Here goes my ser, may be you can see something I'm not seeing ...

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

check_via=no    # (cmd. line: -v)
dns=no           # (cmd. line: -r)
rev_dns=no      # (cmd. line: -R)

fifo="/tmp/ser_fifo"

server_signature=no

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

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"
loadmodule "/usr/local/lib/ser/modules/textops.so"
loadmodule "/usr/local/lib/ser/modules/auth.so"
loadmodule "/usr/local/lib/ser/modules/uri.so"

# NAT STUFF
loadmodule "/usr/local/lib/ser/modules/domain.so"
loadmodule "/usr/local/lib/ser/modules/mediaproxy.so"
loadmodule "/usr/local/lib/ser/modules/nathelper.so"

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

modparam("usrloc", "db_mode", 0)
modparam("registrar", "use_domain", 0)
modparam("rr", "enable_full_lr", 1)

# -- NAT STUFF PARAMS --
modparam("nathelper", "rtpproxy_disable", 1)
modparam("nathelper", "natping_interval", 0)

modparam("mediaproxy", "natping_interval", 30)
modparam("mediaproxy", "sip_asymmetrics",
"/usr/local/etc/ser/sip-asymmetric-clients")
modparam("mediaproxy", "rtp_asymmetrics",
"/usr/local/etc/ser/rtp-asymmetric-clients")

modparam("registrar",  "nat_flag", 6)

# main routing logic

route{
    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;
    };
    if (method=="INVITE" && client_nat_test("3"))
    {
        log(1, " -- INVITE and client_nat_test(3) --\n");
        record_route_preset("208.221.169.88:5060;nat=yes"); # insert IP
address
    }
    else if (!method=="REGISTER")
    {
       record_route();
    };

    if (method=="BYE" || method=="CANCEL")
    {
        log(1, " -- BYE or CANCEL: Media Proxy -- \n");
        end_media_session();
    };

    if (loose_route())
    {
        if (has_totag() && method=="INVITE")
        {
                if (client_nat_test("3") || search("^Route:.*;nat=yes"))
                {
                        setflag(6);
                        use_media_proxy();
                };
        };
        # mark routing logic in request
        route(1);
        break;
    };

    if (!uri==myself)
    {
        route(1);
        break;
    };

    if (uri==myself)
    {
        if (method=="INVITE")
        {
                route(3);
                break;
        }
        else if (method=="REGISTER")
        {
                route(2);
                break;
        };
        if (!lookup("location"))
        {
                sl_send_reply("404", "User Not Found");
                break;
        };
        route(1);
   };
}

route[1]
{
            log(1, " | route[1] entered |\n");

            t_on_reply("1");

            if (!t_relay())
            {
                  if (method=="INVITE" || method=="ACK")
                  {
                            end_media_session();
                  };
                  sl_reply_error();
            };
}

route[2]
{
            log(1, " | route[2] entered |\n");

            if (!search("^Contact: \*") && client_nat_test("7"))
            {
                setflag(6);
                fix_nated_register();
                force_rport();
            };

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

}

route[3]
{
            log(1, " | route[3] entered |\n");

            if (client_nat_test("3"))
            {
                setflag(7);
                force_rport();
                fix_nated_contact();
            };

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

                log(1, " -- Reenviando a SIP Proxy SNOM -- \n");
                rewritehostport("GATEWAY:5060");

            };

            if (isflagset(6) || isflagset(7))
            {
                use_media_proxy();
            };

            route(1);

}

onreply_route[1]
{
            log(1, " +--------------------------+\n");
            log(1, " | onreply_route[1] entered |\n");
            log(1, " +--------------------------+\n");

            if(status=~"486")
            {
                log(1, " -- 486 -> BUSY --\n");
            };

            if(status=~"404")
            {
                log(1, " -- 404 -> NOT REGISTERED --\n");
            };

            if(status=~"180")
            {
                log(1, " -- 180 -> RINGING --\n");
            };

            if(status=~"183")
            {
                log(1, " -- 183 -> SESSION --\n");
            };

            if(status=~"2[0-9][0-9]")
            {
                log(1, " -- 2xx -> OK --\n");
            };

            if ((isflagset(6) || isflagset(7)) &&
(status=~"(180)|(183)|2[0-9][0-9]"))
            {
                if (!search("^Content-Length:\ 0"))
                {
                        #fix_nated_contact();
                        use_media_proxy();
                };
            };

            if (client_nat_test("1"))
            {
                fix_nated_contact();
            };

}

Thank you very much

Regards,

Lucas

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