Edoardo Serra wrote:

Hi all, I have an OpenSER acting as a registrar server and as a load balancer (with dispatcher module) for a cluster of PSTN Gateways based on Asterisk.

When an inbound call is coming from the PSTN, Asterisks dial SIP/user@openser and the call is properly forwarded to the correct user in OpenSER location table

But, if the user wants, for example, to put the call On-Hold, its user agent sends a RE-INVITE to OpenSER. My problem is that OpenSER (correctly) dispatch the call to a random Asterisk GW, and, if it's not the GW which is handling the call, On-Hold does not work and another call is originated.

The call hold RE-INVITE issued by the called UA should include an R-URI including the contact address of the GW who initiated the SIP call. So if a call comes from asterisk.1 the RE-INVITE should include a R-URI like "INVITE sip:ip.of.asterisk.1" (depending of what asterisk.1 puts in its contact header).

In your script you always call ds_select_dst and the RE-INVITEs get routed to a destination from the dispatcher destination set instead of using the R-URI to route the call to the correct GW.

Since you record route each request you could test if the following works:

    # loose-route processing
    if (loose_route()) {
            # mark routing logic in request
            append_hf("P-hint: rr-enforced\r\n");

            # don't do ds_select_dst here since the R-URI
            # of RE-INVITEs should
            # contain the correct GW address
            t_relay();
            exit;
    };

Christian

Tnx in advance for help

Edoardo

My openser.cfg follows

# $Id: ser.cfg,v 1.21.4.1 2003/11/10 15:35:15 andrei Exp $ # ----------- global configuration parameters ------------------------

check_via=yes # (cmd. line: -v) dns=no # (cmd. line: -r) rev_dns=no # (cmd. line: -R) fifo="/tmp/ser_fifo"

#uid=nobody #gid=nobody

# ------------------ module loading ---------------------------------- loadmodule "/usr/lib/openser/modules/sl.so" loadmodule "/usr/lib/openser/modules/tm.so" loadmodule "/usr/lib/openser/modules/rr.so" loadmodule "/usr/lib/openser/modules/maxfwd.so" loadmodule "/usr/lib/openser/modules/usrloc.so" loadmodule "/usr/lib/openser/modules/registrar.so" loadmodule "/usr/lib/openser/modules/nathelper.so" loadmodule "/usr/lib/openser/modules/textops.so" loadmodule "/usr/lib/openser/modules/exec.so" loadmodule "/usr/lib/openser/modules/uri.so" loadmodule "/usr/lib/openser/modules/uri_db.so" loadmodule "/usr/lib/openser/modules/dispatcher.so" loadmodule "/usr/lib/openser/modules/mysql.so" loadmodule "/usr/lib/openser/modules/auth.so" loadmodule "/usr/lib/openser/modules/auth_db.so"

modparam("usrloc", "db_mode", 2) modparam("usrloc", "db_url", "mysql://user:pass@192.168.252.5/openser") modparam("usrloc", "timer_interval", 120) modparam("auth_db", "calculate_ha1", 0) modparam("auth_db", "db_url", "mysql://user:pass@192.168.252.5/db") modparam("uri_db", "db_url", "mysql://user:pass@192.168.252.5/openser") modparam("rr", "enable_full_lr", 1) modparam("registrar", "nat_flag", 6) modparam("registrar", "max_expires", 3600) modparam("registrar", "min_expires", 60) modparam("registrar", "append_branches", 0) modparam("registrar", "desc_time_order", 1) modparam("nathelper", "natping_interval", 20) # Ping interval 20 s modparam("nathelper", "ping_nated_only", 1) # Ping only clients behind NAT modparam("dispatcher", "force_dst", 1)

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

route{ if (!mf_process_maxfwd_header("10")) { sl_send_reply("483","Too Many Hops"); exit; }; if ( msg:len > max_len ) { sl_send_reply("513", "Message too big"); exit; };

    if ( (method=="OPTIONS") || (method=="SUBSCRIBE") || 

(method=="NOTIFY") ) { sl_send_reply("405", "Method Not Allowed"); exit; }

    if (!method=="REGISTER") {
            record_route();
    };


    if ((src_ip==ip.of.asterisk.1) || (src_ip==ip.of.asterisk.1)) {
            if (!lookup("location")) {
                    sl_send_reply("486", "Busy here");
                    exit;
            };
            if (!t_relay()) {
                    sl_reply_error();
            };
            exit;
    };

    if (nat_uac_test("3")) {
            if ((method=="REGISTER") || (method=="INVITE") || 

(method=="OPTIONS")) { fix_nated_contact(); force_rport(); setflag(6); # Mark as NATed } }

    if (method=="REGISTER") {
            if (!proxy_authorize("exorsa", "openser_view")) {
                    proxy_challenge("exorsa", "0");
                    exit;
            }
            if (!check_to()) {
                    sl_send_reply("403", "Digest username and URI 

username do NOT match! Stay away!"); exit; }

            save("location");

            exit;
    };


if (method=="INVITE") {
    if (!proxy_authorize("exorsa", "openser_view")) {
        proxy_challenge("exorsa", "0");
        exit;
    }

    if (!check_from()) {
        sl_send_reply("403", "Digest username and URI username do 

NOT match! Stay away!"); exit; } }

    # loose-route processing
    if (loose_route()) {
            # mark routing logic in request
            append_hf("P-hint: rr-enforced\r\n");
            route(1);
            exit;
    };

    if (!uri==myself) {
            # mark routing logic in request
            append_hf("P-hint: outbound\r\n");
            route(1);
            exit;
    };

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

}

route[1] { # !! Nathelper if (uri=~"[@:](192.168.|10.|172.(1[6-9]|2[0-9]|3[0-1]).)" && !search("^Route:")){ sl_send_reply("479", "We don't forward to private IP addresses"); exit; };

    # NAT processing of replies; apply to all transactions (for 

example, # re-INVITEs from public to private UA are hard to identify as # NATed at the moment of request processing); look at replies t_on_reply("1");

if ((src_ip!=ip.of.asterisk.1) && (src_ip!=ip.of.asterisk.2)) {
        ds_select_dst("1", "0");
    }

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

}

# !! Nathelper onreply_route[1] { # NATed transaction ? if (isflagset(6) && status =~ "(183)|2[0-9][0-9]") { fix_nated_contact(); # otherwise, is it a transaction behind a NAT and we did not # know at time of request processing ? (RFC1918 contacts) } else if (nat_uac_test("1")) { fix_nated_contact(); }; }

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