[SR-Users] issues with dispatcher rerouting to next server when getting a 500 from freeswitch

[Joseph Watson]

Hello Everyone,

I am really having an issue getting kamailio to try another dispatch route
when I get a 500 back from one of my freeswitch servers.

Currently I have a list of freeswitch servers located in my dispatch.list
file. If one of then is to busy it will respond with a 500 Maximum Call in
Progress. I am trying to get Kamailio to go to the next route in the
dispatch.list when it get one of these 503 and if it should exhaust the
whole list respond with a 503. Here is my kamailio config


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

#!ifdef WITH_DEBUG
debug=4
log_stderror=yes
#!else
debug=4
log_stderror=yes
#!endif

memdbg=5
memlog=5

log_facility=LOG_LOCAL0

fork=yes
children=10

/* comment the next line to enable TCP */
disable_tcp=yes

/* uncomment the next line to disable the auto discovery of local aliases
   based on revers DNS on IPs (default on) */
auto_aliases=no

/* uncomment and configure the following line if you want Kamailio to
   bind on a specific interface/port/proto (default bind on all available)
*/
listen=udp:eth0:5060

sip_warning=no

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

#set module path
mpath="/usr/local/lib64/kamailio/modules_k/:/usr/local/lib64/kamailio/modules/"

loadmodule "mi_fifo.so"
loadmodule "kex.so"
loadmodule "tm.so"
loadmodule "tmx.so"
loadmodule "sl.so"
loadmodule "rr.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"


# ----------------- setting module-specific parameters ---------------

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

modparam("xlog", "buf_size", 8192)

# ----- 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", 2000)
modparam("tm", "fr_inv_timer", 40000)
modparam("tm", "remap_503_500", 0)

# ----- dispatcher params -----
modparam("dispatcher", "list_file",
"/usr/local/etc/kamailio/dispatcher.list")
modparam("dispatcher", "flags", 2)
modparam("dispatcher", "dst_avp", "$avp(i:271)")
modparam("dispatcher", "grp_avp", "$avp(i:272)")
modparam("dispatcher", "cnt_avp", "$avp(i:273)")

#modparam("dispatcher", "dst_avp", "$avp(AVP_DST)")
#modparam("dispatcher", "grp_avp", "$avp(AVP_GRP)")
#modparam("dispatcher", "cnt_avp", "$avp(AVP_CNT)")
#modparam("dispatcher", "ds_append_branch", 1)
####### Routing Logic ########


# main request routing logic

route {
        append_hf("X-VSIP-CUST-IP: $si\r\n");
        route(DISPATCH);

        route(RELAY);
}

# Dispatch requests
route[DISPATCH] {
        # round robin dispatching on gateways group '1'
        if(!ds_select_dst("1", "4"))
        {
                send_reply("404", "No destination");
                exit;
        }
#       xlog("L_DBG", "--- 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("DISPATCH");
                        route(RELAY);
                        exit;
                }
        }
}

route[RELAY] {
if (!t_relay()) {
                send_reply("503", "LB01 - All Circuits Are Busy");
#               sl_reply_error();
        }
        exit;
}

I am very new to kamailio and still learning my way around. Any help you
can provide with be fantastic!

Thank you,
Joe Watson
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