[SR-Users] How to unload previously loaded destinations in the case of applying multiple ds_select_domain

[Igor Olhovskiy]

Serdar,

Have you tried to clean variables before calling new ds_select_domain(), 
that are using by dispatcher module failover?

Like 
https://kamailio.org/docs/modules/5.3.x/modules/dispatcher.html#dispatcher.p.xavp_dst 
and so on?

But as I got, you're saying, that calling ds_select_domain() with 
different setid's in a case of fail, not really fails, but using "old" 
available destinations from previous attempt?

Regards,
Igor

On 29.07.2021 11:19, Serdar GÜÇLÜER wrote:
>
>
> Hello all,
>
> I have a trouble that is related to the way of usage of dispatcher module.
>
> I am working with Kamailio 5.3.2 and using dispatcher module as load 
> balancer to route calls to the media gateways.
>
> My dispatching routes are below as simply,
>
> route[DISPATCH] {
> if(ds_select_domain("2", "4")) {
>                 route(MYRELAY);
>         } else {
>                 send_reply("503","Service Unavailable - No MGW");
>                 exit;
>         }
> }
> route[MYRELAY] {
>         t_on_failure("MYFAILURE");
> if(!t_relay()) {
>                 sl_reply_error();
>         }
>         exit;
> }
> failure_route[MYFAILURE] {
>         route(NATMANAGE);
>         revert_uri();
> if (t_is_canceled()) {
>                 exit;
>         }
> if ($T_reply_code == 408 || $T_reply_code == 503) {
> if(ds_next_domain()) {
>                         route(MYRELAY);
>                 } else {
>                         send_reply("503","Service Unavailable");
>                         exit;
>                 }
>         } else {
> if(ds_select_domain("6", "4")) {
>                         route(MYVMRELAY);
>                 } else {
>                         send_reply(486,"Busy");
>                         exit;
>                 }
>         }
> }
> route[MYVMRELAY] {
>         t_on_failure("MYVMFAILURE");
> if(!t_relay()) {
>                 sl_reply_error();
>         }
>         exit;
> }
> failure_route[MYVMFAILURE] {
>         route(NATMANAGE);
>         revert_uri();
> if (t_is_canceled()) {
>                 exit;
>         }
> if(ds_next_domain()) {
>                 route(MYVMRELAY);
>         } else {
>                 send_reply("503","Service Unavailable");
>                 exit;
>         }
> }
>
>
> I have multiple media gateways(setid=2) and voicemail 
> servers(setid=6). As can be seen from the configuration,
> after first routing, for transaction reply code except 408 or 503, I 
> am routing call to the voicemail server using dispatcher.
> In that phase, dispatcher module is remembering previously loaded 
> destinations that come from first ds_select_domain
> and module try to route these destinations in the case that all 
> voicemail servers are unavailable.
> So basically, I want to unload all destinations comes from previous 
> ds_select_domain.
>
> From the documentation, i tried ds_load_update and ds_load_unset 
> methods but not worked for me.
>
> Is there any way to overcome that problem or any right usages of these 
> methods.
>
> Thank you,
>
> Serdar
>
>
>
>
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