New subject: LCR routing, and finaly route to media gateway if not found

23 Sep 2016

Hello List,

I'm finishing my implementation of LCR with kamailio for outgoing calls but
one use case does not work.
Let me explain:
- I have some sbc for one destination. If one destination fail, kamailio
try to second one etc..
- If no SBC is available for this destination (for exemple, all are down),
i want to send my call to an error server (asterisk), play an error sound.

To accomplish this, i re-write the RURI: "sip:error1@errorserver.local",
and launch RELAY route. But kamailio dont make a DNS query to find IP of
"errorserver.local", only change RURI and try to send to the last LCR
gateway.

I have also try to add a new branch, but same result... Why kamailio do not
make a new DNS query ?

*route[RELAY] {        #if (is_method("INVITE")) {        #
if(!t_is_set("failure_route")) t_on_failure("MANAGE_FAILURE");
#}        if (!t_relay()) {                sl_reply_error();
}        exit;}route[NOTFOUND]{        $ru =
"sip:error1@errorserver.local";        xlog("L_WARN",
"[$ci]|$si|Routing
this call to $ru (error server)\n");        append_branch($ru);
route(RELAY);}route[LCR] {        xlog("L_INFO", "[$ci]|$si|Loading
gateways...\n");        if (!load_gws(1)) {                xlog("L_ERR",
"[$ci]|$si|Can't load LCR gateways\n");               
sl_send_reply("503",
"Unable to load gateways");                exit;        } else
{                $var(i) = 0;
while(is_avp_set("$(avp(i:709)[$var(i)])")) {
xlog("L_INFO", "[$ci]|$si|This gateway was found:
gw_uri_avp[$var(i)]=$(avp(i:709)[$var(i)]) \n");
$var(i) = $var(i) + 1;                };
if(is_avp_set("$avp(i:709)")) {                        xlog("L_INFO",
"[$ci]|$si|Trying gateway ‘$avp(i:709)’\n");                } else
{                        xlog("L_INFO", "[$ci]|$si|No more gateways. Goto
route NOTFOUND...\n");
route(NOTFOUND);                };                # try the first matched
gateway                if (next_gw()) {
xlog("L_INFO", "[$ci]|$si|New request URI built: $ru . Relaying it (and
arming backup destination if needed).");                        # Route to
failure for failover
t_on_failure("lcrfailure");
route(RELAY);                } else {                        xlog("L_INFO",
"[$ci]|$si|No more gateways (after next_gw()). Goto route
NOTFOUND...");                        route(NOTFOUND);
};        };        exit;}failure_route[lcrfailure] {        # the previous
gateway is no good        if (t_check_status("408|50[34]"))
{                xlog("L_WARN", "[$ci]|$si|Entering in entering
failure_route[lcrfailure]. Error code: $T_reply_code \n");
if(is_avp_set("$avp(i:709)")) {                        xlog("L_INFO",
"[$ci]|$si|Trying gateway ‘$avp(i:709)’\n");                } else
{                        xlog("L_ERR", "[$ci]|$si|AVP is not
set\n");                };                if (next_gw())
{                        xlog("L_INFO", "[$ci]|$si|New request URI built:
$ru . Relaying it (and arming backup destination if
needed).");                        # Route to failure for
failover
t_on_failure("lcrfailure");
route(RELAY);                } else {                        xlog("L_INFO",
"[$ci]|$si|No more gateways (after next_gw()). Goto route
NOTFOUND...");                        route(NOTFOUND);
};        exit;        };}*

Many thanks,
Regards.