[OpenSIPS-Users] load balancing in opensips

[Ghaith ALKAYYEM]

Hi,

I'm trying to connect OpenSIP to 3 WAN links, and I want to distribute
the traffic between those links according to the dialing number. So, I
tried some modules like lcr and load_balance but the test didn't succeed
because those modules are forwarding the traffic to another SIP gateway
or media gateway.

I tried to change the outbound interface via force_send_socket and
setting mhomed=1 and OpenSIPS still connect through the main interface.

The IPs of the system are:
172.23.1.20
172.23.1.19
172.23.1.18
and the originating IP is always 172.23.1.20

please find a part of my configuration file:




# main request routing logic

mhomed=1

route{

if($ct=~"2000.*")
{
       #load_balance("2","conf");
       force_send_socket(172.23.1.19:5060);
};
if($ct=~"3000.*")
{
       #load_balance("1","conf");
       force_send_socket(172.23.1.18:5060);
};

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

       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();
               exit;
       }

       t_check_trans();

       # authenticate if from local subscriber (uncomment to enable
auth)
       # authenticate all initial non-REGISTER request that pretend to
be

       # 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 (!check_to())
               ##{
               ##      sl_send_reply("403","Forbidden auth ID");
               ##      exit;
               ##}

               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")) {
               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);
}




Many thnaks.