[SR-Users] Kamailio 3.0.4: dispatcher module request

[Carsten Bock]

Hi Klaus,

I used to use that function especially for the purpose of resetting
the failure-counter.
We are using the "ds_set_state("r")" ("r" as "reset counter") in a
"onreply"-route; i will check, why i never commited that patch to the
Kamailio-Repository.
I will add this functionality to git-Trunk in the next few days;
however, since it is a new feature, i will not backport it (but i can
provide patches for 3.1).

Kind regards,
Carsten



2011/2/24 Klaus Feichtinger <klaus.lists at inode.at>:
> Hello list,
>
> I have a question to the dispatcher module in Kamailio version 3.0.4.
>
> In my integration I use this module for distributing calls to a set of
> gateways (with the round robin algorithm). Sometimes a gateway does not
> react or send back a negative response. In that case I use the function
> 'ds_mark_dst("p")' in the failure_route and mark the current destination
> with the flag 'probing'. I have set the threshhold value for probing mode
> to '10'. This means that a gateway is effectively set to probing mode only
> when it was marked with the flag 'probing' for 10 times. However,
> sometimes a gateway is sending back a negative response for e.g. 5 times
> and is afterwards working fine - without any problems. A few hours later
> (e.g.) it is sending a negative reply again for one time. This means: the
> counter for the probing_flags is increasing every time when the function
> ds_mark_dst("p") is executed (in case that the process was not restarted
> in the meantime!). So the problem is, that the counter is reaching the
> threshhold value at any time and at that moment the gateway is set to
> probing mode. Even if the gateway has sent a negative reply for only one
> time (at that moment) - but according the history the proging_flag was set
> several times.
>
> What I miss in this module is a function to _reset_ that flag counter from
> a REPLY_ROUTE. Note: I have to reset the counter, because the gateway does
> not yet SIP OPTIONS requests and therefore it is set to 'probing' all time
> until it is manually set back to active via MI command or after a process
> restart. According the README file (and practical experience) the function
> ds_mark_dst() is executable only within the failure_route. However, when I
> want to set the flag ("a") for the current destination I will do it within
> a reply_route, but not in the failure_route (because I have received a
> positive response and not a negative one). From my point of view it does
> not make sense setting the 'active' flag for a destination from within a
> FAILURE route.
>
> Does anybody have an idea, how the 'flag-counter' could be reset (from
> within the script)? I do not want to use a MI command.....
>
> configuration excerpt:
>
> [...]
> modparam("dispatcher", "db_url",
> "mysql://openser:openserrw@localhost/openser")
> modparam("dispatcher", "table_name", "dispatcher")
> modparam("dispatcher", "dst_avp", "$avp(AVP_DST)")
> modparam("dispatcher", "grp_avp", "$avp(AVP_GRP)")
> modparam("dispatcher", "cnt_avp", "$avp(AVP_CNT)")
> modparam("dispatcher", "ds_ping_from", "sip:proxy at 192.168.37.87")
> modparam("dispatcher", "ds_probing_mode", 0)
> modparam("dispatcher", "ds_probing_threshhold", 10)
> modparam("dispatcher", "ds_ping_interval", 30)
> modparam("dispatcher", "flags", 2)
> modparam("dispatcher", "force_dst", 1)
> [...]
>     if (!ds_select_dst("1", "4")) {
>          sl_send_reply("404", "No destination (disp)");
>          exit;
>     }
>     t_on_failure("failureroute");
>     t_on_reply("replyroute");
> [...]
> failure_route[failureroute] {
> [...]
>     if (t_check_status("[45][08]0") || (t_branch_timeout() &&
> !t_branch_replied())) {
>          ds_mark_dst("p");
>          if (!ds_next_dst()) {
>               t_reply("404", "No destination (disp)");
>               exit;
>          }
>          t_on_failure("failureroute");
>          t_on_reply("replyroute");
>     }
>
> [...]
> }
> onreply_route [replyroute] {
>     if (t_check_status("180|200") {
>          # nice to have......
> #          ds_mark_dst("a");
>     }
> }
>
> Thanks in advance!
>
> regards,
> Klaus
>
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> sr-users at lists.sip-router.org
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>



-- 
Carsten Bock
Schomburgstr. 80
22767 Hamburg
Germany

Mobile +49 179 2021244
Home +49 40 34927217
Büro (Verl) +49 5246 801427
Fax +49 40 34927218
mailto:carsten at bock.info