[OpenSIPS-Users] OpenSIPS 1.7 + NAT + rtpproxy

Ashish Kundu kash906 at gmail.com
Thu Aug 2 23:27:52 CEST 2012


Opensips is a great product, but I have been having problem in configuring
the nat traversal + rtpproxy with opensips and have spent about a week on
this.  I am a novice in this... when opensips runs with the following
opensips.cfg relevant portions -- it raises the following rtpproxy problem:

"ERROR:rtpproxy:select_rtpp_node: script error -no valid set selected"
"ERROR:rtpproxy:force_rtp_proxy: no available proxies"

#-------- nat_traversal params -----
modparam("nat_traversal", "keepalive_interval", 30)
modparam("nat_traversal", "keepalive_method", "OPTIONS")
modparam("nat_traversal", "keepalive_from", "sip:keepalive at a.b.c.d")
modparam("nat_traversal", "keepalive_state_file",
"/var/run/opensips/keepalive_state")

#ak# --- rtpproxy -----
# single rtproxy with specific weight
modparam("rtpproxy", "rtpproxy_sock", "udp:localhost:9999")
modparam("rtpproxy", "nortpproxy_str", "a=sdpmangled:yes\r\n")
modparam("rtpproxy", "db_url", "mysql://opensips:opensipsrw@localhost
/opensips")
#modparam("rtpproxy", "db_table", "nh_rtpp")
modparam("rtpproxy", "rtpp_socket_col", "rtpproxy_sock")


####### Routing Logic ########


# main request routing logic

route{
        ####nat_traversal info
        force_rport();
        if (client_nat_test("7")) {
                fix_contact();
                setflag(5);
        }

        if ((method=="REGISTER" || method=="SUBSCRIBE" ||
                (method=="INVITE" && !has_totag())) && client_nat_test("7"))
        {
                nat_keepalive();
        }
        ####nat_traversal info ends

        if (!mf_process_maxfwd_header("10")) {
                sl_send_reply("483","Too Many Hops");
                exit;
        }

        ##ak#
        if ((is_method("INVITE")) && has_totag()) {
#(has_body("application/sdp"))) {
                engage_rtp_proxy();
        }

        if (has_totag()) {
                # sequential request withing a dialog should
                # take the path determined by record-routing
                if (loose_route()) {
                        if (is_method("BYE")) {
                                setflag(1); # do accounting ...
                                setflag(3); # ... even if the transaction
fails
                        } else if (is_method("INVITE")) {
                                # even if in most of the cases is useless,
do RR for
                                # re-INVITEs alos, as some buggy clients do
change route set
                                # during the dialog.
                                record_route();
                        }
                        # route it out to whatever destination was set by
loose_route()
                        # in $du (destination URI).
                        route(1);
                } else {
                        /* uncomment the following lines if you want to
enable presence */
##if (is_method("SUBSCRIBE") && $rd == "your.server.ip.address") {
                        ##      # in-dialog subscribe requests
                        ##      route(2);
                        ##      exit;
                        ##}
                        if ( is_method("ACK") ) {
                                if ( t_check_trans() ) {
                                        # non loose-route, but stateful
ACK; must be an ACK after
                                        # a 487 or e.g. 404 from upstream
server
                                        t_relay();
                                        exit;
                                } else {
                                        # ACK without matching transaction
->
                                        # ignore and discard
                                        exit;
                                }
                        }
                        sl_send_reply("404","Not here");
                }
                exit;
        }

        #initial requests

        # CANCEL processing
        if (is_method("CANCEL"))
        {
                if (t_check_trans())
                        t_relay();
                #unforce_rtpproxy();
                exit;
        }

        t_check_trans();

# preloaded route checking
        if (loose_route()) {
                xlog("L_ERR",
                "Attempt to route with preloaded Route's
[$fu/$tu/$ru/$ci]");
                if (!is_method("ACK"))
                        sl_send_reply("403","Preload Route denied");
                exit;
        }

        # record routing
        if (!is_method("REGISTER|MESSAGE"))
                record_route();

        # account only INVITEs
        if (is_method("INVITE")) {
                setflag(1); # do accounting
        }
        if (!uri==myself)
        ## replace with following line if multi-domain support is used
        ##if (!is_uri_host_local())
        {
                append_hf("P-hint: outbound\r\n");
                # if you have some interdomain connections via TLS
                ##if($rd=="tls_domain1.net") {
                ##      t_relay("tls:domain1.net");
                ##      exit;
                ##} else if($rd=="tls_domain2.net") {
                ##      t_relay("tls:domain2.net");
                ##      exit;
                ##}
                route(1);
        }

        # requests for my domain

        ## uncomment this if you want to enable presence server
        ##   and comment the next 'if' block
        ##   NOTE: uncomment also the definition of route[2] from  below
        ##if( is_method("PUBLISH|SUBSCRIBE"))
        ##              route(2);

        if (is_method("PUBLISH"))
        {
                sl_send_reply("503", "Service Unavailable");
                exit;
        }


        if (is_method("REGISTER"))
        {
                # authenticate the REGISTER requests (uncomment to enable
auth)
                ##if (!www_authorize("", "subscriber"))
##{
                ##      www_challenge("", "0");
                ##      exit;
                ##}
                ##
                ##if (!db_check_to())
                ##{
                ##      sl_send_reply("403","Forbidden auth ID");
                ##      exit;
                ##}

                #---- Request is behind NAT(flag5) save with bflag 6 ----#
                #---- Use bflag 7 to start SIP pinging (Options)     ----#
                if (isflagset(5)) {
                        setbflag(6);
                        setbflag(7);
                };

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

                exit;
        }

        if ($rU==NULL) {
                # request with no Username in RURI
                sl_send_reply("484","Address Incomplete");
                exit;
        }

        # apply DB based aliases (uncomment to enable)
        ##alias_db_lookup("dbaliases");
if (!lookup("location","m")) {
                switch ($retcode) {
                        case -1:
                        case -3:
                                t_newtran();
                                t_reply("404", "Not Found");
                                exit;
                        case -2:
                                sl_send_reply("405", "Method Not Allowed");
                                exit;
                }
        }

        # when routing via usrloc, log the missed calls also
        setflag(2);

        route(1);
}


route[1] {
        # for INVITEs enable some additional helper routes

         #---- RTP Proxy handling ---#
        if (is_method("BYE|CANCEL")) {
                unforce_rtp_proxy();
        } else if (is_method("INVITE")){
                #---- Activates the RTP Proxy for the CALLEE ---#
                rtpproxy_offer();
        };
        #ak## catch and fix replies
        #ak#t_on_reply("2");

        if (is_method("INVITE")) {
                t_on_branch("2");
                t_on_reply("2");
                t_on_failure("1");
        }

        if (!t_relay()) {
                sl_reply_error();
        };
        exit;
}

branch_route[2] {
        if (client_nat_test("3")) {
                fix_contact();
        }

        xlog("new branch at $ru\n");
}


onreply_route[2] {
        if (client_nat_test("7")) {
                fix_contact();
                if ( is_method("INVITE") && has_body("application/sdp") ){
                        ######ak# (isflagset(5) || isbflagset(6)) &&
                        rtpproxy_answer();
                }
        }
        xlog("incoming reply\n");
}


failure_route[1] {

        if (t_was_cancelled()) {
                exit;
        }

        # uncomment the following lines if you want to block client
        # redirect based on 3xx replies.
        ##if (t_check_status("3[0-9][0-9]")) {
        ##t_reply("404","Not found");
        ##      exit;
        ##}

        # uncomment the following lines if you want to redirect the failed
        # calls to a different new destination
        ##if (t_check_status("486|408")) {
        ##      sethostport("192.168.2.100:5060");
        ##      # do not set the missed call flag again
        ##      t_relay();
        ##}
}
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