====== Audio only works one way, when connected with client behind nat ======



===== Answer  =====

  - install mediaproxy module
  - install mediaproxy dispatcher
  - install mediaproxy server

** Follow the install procedure and try using this openser.cfg : **

<code c>

#

# ----------- global configuration parameters ------------------------

#debug=3         # debug level (cmd line: -dddddddddd)

#fork=yes

#log_stderror=no        # (cmd line: -E)

#log_facility=LOG_LOCAL0

/* 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/openser_fifo"

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

# Uncomment this if you want to use SQL database

loadmodule "/usr/local/openser/lib/openser/modules/mysql.so"

loadmodule "/usr/local/openser/lib/openser/modules/domain.so"

loadmodule "/usr/local/openser/lib/openser/modules/mediaproxy.so"

loadmodule "/usr/local/openser/lib/openser/modules/uri_db.so"

loadmodule "/usr/local/openser/lib/openser/modules/sl.so"

loadmodule "/usr/local/openser/lib/openser/modules/tm.so"

loadmodule "/usr/local/openser/lib/openser/modules/rr.so"

loadmodule "/usr/local/openser/lib/openser/modules/maxfwd.so"

loadmodule "/usr/local/openser/lib/openser/modules/usrloc.so"

loadmodule "/usr/local/openser/lib/openser/modules/registrar.so"

loadmodule "/usr/local/openser/lib/openser/modules/textops.so"

# Uncomment this if you want digest authentication

# mysql.so must be loaded !

loadmodule "/usr/local/openser/lib/openser/modules/auth.so"

loadmodule "/usr/local/openser/lib/openser/modules/auth_db.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")

# -- rr params --

# add value to ;lr param to make some broken UAs happy

modparam("rr", "enable_full_lr", 1)

modparam("mediaproxy", "natping_interval", 60)

modparam("registrar",  "nat_flag",         2)

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

# main routing logic

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;
        };
        if (msg:len >=  2048 ) {
                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 entities
        # use different transport protocol
        if (!method=="REGISTER") record_route();

        # subsequent messages withing a dialog should take the
        # path determined by record-routing
        if (loose_route()) {
                # mark routing logic in request
                append_hf("P-hint: rr-enforced\r\n");
                route(1);
                break;
        };

        if (!uri==myself) {
                # mark routing logic in request
                append_hf("P-hint: outbound\r\n");
                route(1);
                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") {
                       # Uncomment this if you want to use digest authentication
                       if (!www_authorize("sip.com", "subscriber")) {
                               www_challenge("sip.com", "0");
                               break;
                       };

                       if (client_nat_test("3")) {
                               setflag(2);
                               force_rport();
                               fix_contact();
                       };

                       save("location");
                       break;

                };

                lookup("aliases");
                if (!uri==myself) {
                        append_hf("P-hint: outbound alias\r\n");
                        route(1);
                        break;
                };

                # native SIP destinations are handled using our USRLOC DB
                if (!lookup("location")) {
                        sl_send_reply("404", "Not Found");
                        break;
                };
        };

        if (method=="INVITE") {
                t_on_failure("1");
        } else if (method == "BYE" || method == "CANCEL") {
                end_media_session();
        };

        if (loose_route()) {
                if (method=="INVITE" || method=="ACK") {
                        use_media_proxy();
                };
                t_relay();
                break;
        };

        if (client_nat_test("3") && !search("^Record-Route:")) {
                # Mark as NAT'ed
                force_rport();
                fix_contact();
        };

        if (method=="INVITE") {
                t_on_reply("1");
        };

        if (method=="INVITE" || method=="ACK") {
                use_media_proxy();
        };

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

        append_hf("P-hint: usrloc applied\r\n");
        # route(1);

}

route[1]
{
        # send it out now; use stateful forwarding as it works reliably
        # even for UDP2TCP
        if (!t_relay()) {
                sl_reply_error();
        };
}

failure_route[1] {
    end_media_session();
}

onreply_route[1] {
    if (status=~"(183)|(2[0-9][0-9])") {
        if (client_nat_test("1")) {
            fix_contact();
        };
        use_media_proxy();
    };
}
</code>

===== Troubleshooting Stuff =====

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