# 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");
                exit;
        };

        if (msg:len >= 2048 ) {
                sl_send_reply("513", "Message too big");
                exit;
        };

        # 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);
        };

if (!uri==myself) {
                # mark routing logic in request
                append_hf("P-hint: outbound\r\n");
                # if you have some interdomain connections via TLS
                #if(uri=~"@tls_domain1.net") {
                #       t_relay("tls:domain1.net");
                #       exit;
                #} else if(uri=~"@tls_domain2.net") {
                #       t_relay("tls: domain2.net");
                #       exit;
                #}
                route(1);
        };

        # 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("192.168.3.15", "subscriber")) {
                        #       www_challenge("192.168.3.15", "0");
                        #       exit;
                        #};

                        save("location");
                        exit;
                };

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

                # native SIP destinations are handled using our USRLOC DB
                if (!lookup("location")) {
                        sl_send_reply("404", "Not Found");
                        exit;
                       }
                 else {
                         append_branch();
                         append_hf("P-hint: usrloc applied\r\n");
                         t_relay();
                }
        };
        route(1);
}