[OpenSIPS-Users] Failover using dispatcher in opensips 1.11

[Bogdan-Andrei Iancu]

Hi Gunjan,

the ds_select_dst() will just pick the first to be used and prepares the 
rest of the available destination (this function does not do any SIP 
signaling, it just get the available destinations from the indicated 
set). The function returns false only if there is no available (know to 
be available) destination in the set.

To have a model, please use the "make menuconfig" to generate a 
load-balancer like script using dispatcher - this will give you a hint 
on how dispatcher has to be configured for failover.

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com

On 23.02.2016 09:29, Gunjan Korlekar wrote:
> Hello,
>
> I am new to the dispatcher module on opensips 1.11 and was trying to 
> understand how failover works in the ds_select_dst function. I tried 
> searching for answers online but I could not get much clarity.
>
> So, I have a bunch of destinations in my dispatcher table and the 
> following piece of code in my route function in the config file -
>
> if ( !ds_select_dst("1", "4") ) {
>     xlog("L_INFO", "ds_select_dst error");
>     send_reply("500","Unable to route");
>   }
>
> I have ds_probing_mode set in my config file so it always knows what 
> destinations are active.
>
> Can you please help in clarifying the following -
>
> Will the ds_select_dst() return a 'False' only after it has tried all 
> the destinations in the dispatcher table or just the one that gets 
> selected in the round-robin?
>
> If above is not true and the destination selected by ds_select_dst 
> turns out to be non reachable, will the above call return False for 
> the destination that it picks? In such a case can you guide me as to 
> what I can do so that it selects the next available destination in the 
> dispatcher list?
>
> What is the default value of 'max_results' in the ds_select_dst() 
> signature and does it affect failover selection?
>
> Thanks in advance!
>
> -- 
> Thanks,
> Gunjan
>
>
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