Hi Carsten,

Thanks again for your kind reply.
I am quite newbie to kamailio,  and I dont see why the load balancer is replying "500".

It will be great appreciated if you can point out what i am doing wrong in my config file as below.
Actually, there is another issue for the setting below is that it cannot load balancing the "REGISTER" correctly.

best regards,

chanea

==============================================================

####### Global Parameters #########
#!define WITH_NAT



# - flags
#   FLT_ - per transaction (message) flags
# FLB_ - per branch flags
#!define FLT_ACC 1
#!define FLT_ACCMISSED 2
#!define FLT_ACCFAILED 3
#!define FLT_NATS 5

#!define FLB_NATB 6
#!define FLB_NATSIPPING 7

####### Global Parameters #########

debug=-3
log_stderror=no

memdbg=5
memlog=5

log_facility=LOG_LOCAL0

fork=yes
children=8

disable_tcp=yes

auto_aliases=no

port=5060


sip_warning=no

####### Modules Section ########

# set paths to location of modules
#!ifdef LOCAL_TEST_RUN
mpath="modules_k:modules"
#!else
mpath="/usr/local/lib64/kamailio/modules_k/:/usr/local/lib64/kamailio/modules/"
#!endif
loadmodule "db_mysql.so"
loadmodule "mi_fifo.so"
loadmodule "kex.so"
loadmodule "tm.so"
loadmodule "tmx.so"
loadmodule "sl.so"
loadmodule "rr.so"
loadmodule "usrloc.so"
loadmodule "pv.so"
loadmodule "maxfwd.so"
loadmodule "textops.so"
loadmodule "siputils.so"
loadmodule "xlog.so"
loadmodule "sanity.so"
loadmodule "ctl.so"
loadmodule "mi_rpc.so"
loadmodule "acc.so"
loadmodule "dispatcher.so"

#!ifdef WITH_NAT
loadmodule "nathelper.so"
loadmodule "rtpproxy.so"
#!endif


# ----- mi_fifo params -----
modparam("mi_fifo", "fifo_name", "/tmp/kamailio_fifo")


# ----- rr params -----
# add value to ;lr param to cope with most of the UAs
modparam("rr", "enable_full_lr", 1)
# do not append from tag to the RR (no need for this script)
modparam("rr", "append_fromtag", 0)


# ----- acc params -----
modparam("acc", "log_flag", 1)
modparam("acc", "failed_transaction_flag", 3)
modparam("acc", "log_extra", 
"src_user=$fU;src_domain=$fd;dst_ouser=$tU;dst_user=$rU;dst_domain=$rd;src_ip=$si")

# ----- tm params -----
modparam("tm", "fr_timer", 10000)
modparam("tm", "fr_inv_timer", 40000)


#!ifdef WITH_NAT
# ----- rtpproxy params -----
#modparam("rtpproxy", "rtpproxy_sock", "udp:127.0.0.1:7722")
modparam("rtpproxy", "rtpproxy_sock", "udp:{myipaddr}:22222")
# ----- nathelper params -----
modparam("nathelper", "natping_interval", 600)
modparam("nathelper", "ping_nated_only", 1)
modparam("nathelper", "sipping_bflag", FLB_NATSIPPING)
modparam("nathelper", "sipping_from", "sip:pinger@{myipaddr}")

# params needed for NAT traversal in other modules
modparam("nathelper|registrar", "received_avp", "$avp(RECEIVED)")
modparam("usrloc", "nat_bflag", FLB_NATB)
#!endif


# ----- dispatcher params -----
modparam("dispatcher", "db_url",
"mysql://{mydbsetting}")
modparam("dispatcher", "table_name", "dispatcher")
modparam("dispatcher", "flags", 2)
modparam("dispatcher", "dst_avp", "$avp(AVP_DST)")
modparam("dispatcher", "grp_avp", "$avp(AVP_GRP)")
modparam("dispatcher", "cnt_avp", "$avp(AVP_CNT)")

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


# main request routing logic

route {

# per request initial checks
route(REQINIT);

# NAT detection
route(NAT);

# handle requests within SIP dialogs
route(WITHINDLG);

### only initial requests (no To tag)

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

t_check_trans();

# record routing for dialog forming requests (in case they are routed)
# - remove preloaded route headers
remove_hf("Route");
if (is_method("INVITE|SUBSCRIBE"))
record_route();

# account only INVITEs
if (is_method("INVITE"))
{
setflag(1); # do accounting
}

# dispatch destinations
route(DISPATCH);

route(RELAY);
}


route[RELAY] {
#!ifdef WITH_NAT
if (check_route_param("nat=yes")) {
setbflag(FLB_NATB);
}
if (isflagset(FLT_NATS) || isbflagset(FLB_NATB)) {
route(RTPPROXY);
}
#!endif
if (!t_relay()) {
sl_reply_error();
}
exit;
}


# Per SIP request initial checks
route[REQINIT] {
if (!mf_process_maxfwd_header("10")) {
sl_send_reply("483","Too Many Hops");
exit;
}

if(!sanity_check("1511", "7"))
{
xlog("Malformed SIP message from $si:$sp\n");
exit;
}
}

# Caller NAT detection route
route[NAT] {
#!ifdef WITH_NAT
force_rport();
if (nat_uac_test("19")) {
#xlog("L_INFO","ALERT: ua is behind NAT (ru:$ru)(IP:$si:$sp)\n");

if (method=="REGISTER") {
fix_nated_register();
} else {
fix_nated_contact();
}
setflag(FLT_NATS);
}
#!endif
return;
}

# RTPProxy control
route[RTPPROXY] {
#!ifdef WITH_NAT
if (is_method("BYE")) {
unforce_rtp_proxy();
} else if (is_method("INVITE")){
force_rtp_proxy();
}
if (!has_totag()) add_rr_param(";nat=yes");
#!endif
return;
}



# Handle requests within SIP dialogs
route[WITHINDLG] {
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
}
route(RELAY);
} else {
if ( is_method("ACK") ) {
if ( t_check_trans() ) {
# non loose-route, but stateful ACK;
# must be 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;
}
}

# Dispatch requests
route[DISPATCH] {
# round robin dispatching on gateways group '1'
if(!ds_select_dst("1", "0"))
{
send_reply("404", "No destination");
exit;
}
xlog("L_INFO", "--- SCRIPT: going to <$ru> via <$du>\n");
t_on_failure("RTF_DISPATCH");
return;
}

# Sample failure route
failure_route[RTF_DISPATCH] {
if (t_is_canceled()) {
exit;
}
# next DST - only for 500 or local timeout
if (t_check_status("500")
or (t_branch_timeout() and !t_branch_replied()))
{
if(ds_next_dst())
{
t_on_failure("RTF_DISPATCH");
route(RELAY);
exit;
}
}
}
=================================================================



On Tue, Feb 26, 2013 at 8:32 PM, Carsten Bock <carsten@ng-voice.com> wrote:
Hi,

the dispatcher module doesn't create "500 Internal Server Error" replies.
There must be another source for your error; most likely not the
Kamailio Loadbalancer.

Kind regards,
Carsten

2013/2/26 chanea <chanea@gmail.com>:
> Hi Carsten,
>
> Thanks for your quick reply.
> The "500" is generated by the Kamailio server which is used as Load balancer
> ( using dispatcher module).
>
> I dont see any 500 number in my kamailio.cfg in the load balancer kamailio.
> Should I go deep into the dispatcher module itself?
>
>
> Unluckily I cannot check the reason by checking the syslog since this only
> happen when thousands of request come in at the same time.
>
> chanea
>
>
>
> On Tue, Feb 26, 2013 at 7:24 PM, Carsten Bock <carsten@ng-voice.com> wrote:
>>
>> Hi,
>>
>> can you see, why the Kamailio is returning a "500 Server internal
>> error"? This response must be either created by some module or by some
>> upstream server (e.g. in case of loadbalancing).
>> Kamailio itself would not create such response, you should (if at all)
>> find the answer in the logs...
>>
>> Kind regards,
>> Carsten
>>
>> 2013/2/26 chanea <chanea@gmail.com>:
>> > Dear all
>> >
>> > While lots of request come to my Kamailio 3.1.x in the same time ,
>> > server
>> > is returning "500, Server Internal Error" to some of the request.
>> >
>> > What should i do if i want to reduce the number of "500" response?
>> >
>> >
>> >
>> > chanea
>> >
>> > _______________________________________________
>> > sr-dev mailing list
>> > sr-dev@lists.sip-router.org
>> > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
>> >
>>
>>
>>
>> --
>> Carsten Bock
>> CEO (Geschäftsführer)
>>
>> =============================================================
>> Visit us on the Kamailio World 2013, 16./17. April 2013
>> => http://conference.kamailio.com/k01/                             See
>> you there!
>> =============================================================
>>
>> ng-voice GmbH
>> Schomburgstr. 80
>> D-22767 Hamburg / Germany
>>
>> http://www.ng-voice.com
>> mailto:carsten@ng-voice.com
>>
>> Office +49 40 34927219
>> Fax +49 40 34927220
>>
>> Sitz der Gesellschaft: Hamburg
>> Registergericht: Amtsgericht Hamburg, HRB 120189
>> Geschäftsführer: Carsten Bock
>> Ust-ID: DE279344284
>>
>> Hier finden Sie unsere handelsrechtlichen Pflichtangaben:
>> http://www.ng-voice.com/imprint/
>>
>> _______________________________________________
>> sr-dev mailing list
>> sr-dev@lists.sip-router.org
>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
>
>
>
> _______________________________________________
> sr-dev mailing list
> sr-dev@lists.sip-router.org
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
>



--
Carsten Bock
CEO (Geschäftsführer)

=============================================================
Visit us on the Kamailio World 2013, 16./17. April 2013
=> http://conference.kamailio.com/k01/                             See
you there!
=============================================================

ng-voice GmbH
Schomburgstr. 80
D-22767 Hamburg / Germany

http://www.ng-voice.com
mailto:carsten@ng-voice.com

Office +49 40 34927219
Fax +49 40 34927220

Sitz der Gesellschaft: Hamburg
Registergericht: Amtsgericht Hamburg, HRB 120189
Geschäftsführer: Carsten Bock
Ust-ID: DE279344284

Hier finden Sie unsere handelsrechtlichen Pflichtangaben:
http://www.ng-voice.com/imprint/

_______________________________________________
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