[Users] How to use the failover support in the dispatcher module?
Wolfgang Hottgenroth
woho at hottis.de
Fri Jan 13 15:44:02 CET 2006
Hi,
on 18. 12. 2005 Daniel-Constantin Mierla accounted on this list that the
dispatcher module now has a kind of failover support. I was really
curious for this feature, since I had to config openser to support both
load-balancing and failover.
Failover works fine: if one PSTNGW is not available, the next one is
tried, until one works.
But unfortunately, for negative status reports (like 'busy'), the
failure_route is also entered and thereby also the failover mechanism is
triggered, with the result that a 'busy' is signalled to the A-side as
'no more gws'.
(I've tried different mechanisms for ds_select_domain, also I tried with
and without the append_branch in the failure_route block.)
Any hints for me?
Thank you very much!
Wolfgang
debug=3
fork=yes
log_stderror=yes # (cmd line: -E)
check_via=no # (cmd. line: -v)
dns=no # (cmd. line: -r)
rev_dns=no # (cmd. line: -R)
port=5060
children=4
fifo="/tmp/openser_fifo"
# ------------------ module loading ----------------------------------
loadmodule "/opt/openser/lib/openser/modules/sl.so"
loadmodule "/opt/openser/lib/openser/modules/tm.so"
loadmodule "/opt/openser/lib/openser/modules/rr.so"
loadmodule "/opt/openser/lib/openser/modules/maxfwd.so"
loadmodule "/opt/openser/lib/openser/modules/usrloc.so"
loadmodule "/opt/openser/lib/openser/modules/registrar.so"
loadmodule "/opt/openser/lib/openser/modules/textops.so"
loadmodule "/opt/openser/lib/openser/modules/xlog.so"
loadmodule "/opt/openser/lib/openser/modules/dispatcher.so"
# ----------------- setting module-specific parameters ---------------
modparam("rr", "enable_full_lr", 1)
modparam("xlog", "buf_size", 8192)
modparam("dispatcher", "list_file",
"/opt/openser/etc/openser/dispatcher.list")
modparam("dispatcher", "force_dst", 1)
modparam("dispatcher", "flags", 3)
modparam("tm", "fr_timer", 5)
# ------------------------- request routing logic -------------------
# main routing logic
route[0] {
xlog("L_NOTICE", "----> before route 1 <----\n");
route(1);
xlog("L_NOTICE", "----> after route 1 <----\n");
}
route[1] {
if (loose_route()) {
xlog("L_NOTICE", "*** loose routing enforced: $rm, $ru, $si, $du\n");
t_relay();
return;
}
record_route();
xlog("L_NOTICE", "REQUEST: $rm, $ru, $si, $du\n");
if (method=="REGISTER") {
xlog("L_NOTICE", "*** register request from $si\n");
sl_send_reply("503", "No registrar service here");
return;
}
if (method=="INVITE" && ! uri=~"^sip:\+[1-9][0-9]+@") {
xlog("L_NOTICE", "*** illegal sip uri: $ru\n");
sl_send_reply("484", "International number required");
return;
}
# --- customer specific part ---------------------------------------
if ( src_ip==62.191.185.122 ) {
xlog("L_NOTICE", "*** $rm from laptop-who, $si\n");
append_hf("P-Hint: from laptop-who\n");
append_hf("Remote-Party-ID:
<sip:+492319721231 at 62.191.185.47>;party=calling;screen=yes;privacy=off\n");
if (method=="INVITE") {
strip(1);
prefix("+0000666666");
}
ds_select_domain("00", "4");
if (method=="INVITE") {
t_on_failure("2");
}
xlog("L_NOTICE", "----> before t_relay <----\n");
t_relay();
xlog("L_NOTICE", "----> after t_relay <----\n");
return;
}
if ( src_ip==62.191.185.29 ) {
xlog("L_NOTICE", "*** $rm from laptop-aholt, $si\n");
append_hf("P-Hint: from laptop-aholt\n");
append_hf("Remote-Party-ID:
<sip:+492319721231 at 62.191.185.47>;party=calling;screen=yes;privacy=off\n");
if (method=="INVITE") {
strip(1);
prefix("+0100555555");
}
ds_select_domain("01", "4");
if (method=="INVITE") {
t_on_failure("2");
}
xlog("L_NOTICE", "----> before t_relay <----\n");
t_relay();
xlog("L_NOTICE", "----> after t_relay <----\n");
return;
}
if ( src_ip==62.191.185.53 ) {
xlog("L_NOTICE", "*** $rm from ipphone-who, $si\n");
append_hf("P-Hint: from ipphone-who\n");
append_hf("Remote-Party-ID:
<sip:+492319721231 at 62.191.185.47>;party=calling;screen=yes;privacy=off\n");
if (method=="INVITE") {
strip(1);
prefix("+0100555555");
}
ds_select_domain("01", "4");
if (method=="INVITE") {
t_on_failure("2");
}
xlog("L_NOTICE", "----> before t_relay <----\n");
t_relay();
xlog("L_NOTICE", "----> after t_relay <----\n");
return;
}
if ( src_ip==127.0.2.1 || src_ip==127.0.2.2 ) {
xlog("L_NOTICE", "*** $rm from cust3, $si\n");
append_hf("P-Hint: from cust3\n");
append_hf("Remote-Party-ID:
<sip:+492319721231 at 62.191.185.47>;party=calling;screen=yes;privacy=off\n");
if (method=="INVITE") {
strip(1);
prefix("+0200000003");
}
ds_select_domain("02", "4");
if (method=="INVITE") {
t_on_failure("2");
}
xlog("L_NOTICE", "----> before t_relay <----\n");
t_relay();
xlog("L_NOTICE", "----> after t_relay <----\n");
return;
}
# ------------------------------------------------------------------
if (method=="INVITE") {
xlog("L_NOTICE", "*** reject invite from $si\n");
t_reply("403", "Forbidden");
return;
}
xlog("L_NOTICE", "*** $rm from $si\n");
t_relay();
}
failure_route[2] {
xlog("L_NOTICE", "*** in failure_route 1: rc: $rc, rr: $rr, rs: $rs\n");
if (! ds_next_domain()) {
t_reply("503", "Service unavailable: no more gws");
return;
} else {
append_branch();
t_on_failure("2");
t_relay();
return;
}
}
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