[SR-Users] load-balance to registered trunks?

[Alex Balashov]

You can trigger a reload via the jsonrpcs module. If it's available as an RPC function externally, you can call it internally. 

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-----Original Message-----
From: David Villasmil <david.villasmil.work at gmail.com>
To: "Kamailio (SER) - Users Mailing List" <sr-users at lists.kamailio.org>
Sent: Mon, 03 Sep 2018 5:59 AM
Subject: Re: [SR-Users] load-balance to registered trunks?

Thanks for replying!

Interesting approach! Though i don't think that will work for me. I've been
looking into my requirements, and I'd need to do weight-based distribution
instead of load-balance,  also what i need is to add destinations to the
dispatcher lists dynamically. I was thinking of adding them dynamically
when they register, but the module doesn't have a function to reload the
list via the config script, or a db_mode as on other modules. This one is
going to be tricky...

Any ideas?

David

On Mon, Sep 3, 2018, 00:26 Alex Balashov <abalashov at evaristesys.com> wrote:

> On Sun, Sep 02, 2018 at 11:58:37PM +0100, David Villasmil wrote:
>
> > I've got this scenario where some gateways will register on my
> > kamailio and i need to send them calls on a load-balance fashion.  is
> > this possible?
>
> Sure, anything is possible in Kamailio if you write the logic for it.
> :-)
>
> I like stateless load-balancing methods where possible - the fewer
> moving parts, the better.
>
> You can do a lookup() and then t_load_contacts(),
>
>
> https://kamailio.org/docs/modules/5.1.x/modules/tm.html#tm.f.t_load_contacts
>
> and examine the size of the `contacts_avp`, e.g. by iterating through it
> with a while loop as you would any XAVP:
>
>    $var(num_contacts) = 0;
>
>    while(defined $xavp(whatever[$var(num_contacts)]))
>       $var(num_contacts) = $var(num_contacts) + 1;
>
> or you can reg_fetch_contacts() and do the same with the $ulc PV:
>
>
> https://kamailio.org/docs/modules/5.1.x/modules/registrar.html#registrar.f.reg_fetch_contacts
>
> and access the number of registrants for the AOR via profile=>count:
>
>    if(reg_fetch_contacts("location", "$ru", "blah")) {
>        # Concurrent contact count is available as $ulc(blah=>count);
>
>        ...
>    }
>
> I prefer the latter.
>
> Either way, once you have a count, judicious use of cfgutils:$RANDOM
>
>
> https://www.kamailio.org/wiki/cookbooks/5.1.x/pseudovariables#random_-_random_number
>
> will have you on your way to sending the call to a random contact of the
> bunch. For sufficiently large samples, random distribution is
> substantially similar to round-robin load balancing.
>
> If you need failover with that load-balancing, you'll have to buffer
> these contacts into an XAVP and serially fork through them with a
> failure_route. Either way, it's all quite doable.
>
> If what you're asking is whether there is a built-in facility to effect
> load balancing across registrants, I'm not aware of one, though it could
> be my ignorance.
>
> -- Alex
>
> --
> Alex Balashov | Principal | Evariste Systems LLC
>
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>
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