[SR-Users] LCR options as of 2018

[Daniel-Constantin Mierla]

Hello,


On 12.02.18 13:52, Francisco Valentin Vinagrero wrote:
>
> Hello,
>
>  
>
> I am configuring a Kamailio node that will interface with 3 carriers
> and will implement Least Cost Routing for around 900 destinations.
>
>  
>
> I have already implemented a quick prototype with the LCR module and I
> have been reading the CarrierRoute doc and the CGrates site.
>
>  
>
> I don’t really need advanced functionality, just:
>
> -          Re-routing to a backup carrier when the main one is not
> available.
>
> -          Ping with OPTIONS to all carriers so I can detect if any of
> them is not available (à la Dispatcher)
>
> -          Translate prices from a central DB to routing priorities.
>
> -          Get some accounting post-call info about the routing
> decision (acc module)
>
>  
>
> So far, while testing the LCR module I have had some issues with the
> rule IDs being integers that auto-increment, so the LCR rules need to
> be referenced from the rule_target table using this numeric ID. I can
> see some issues when scaling this to 900 lcr_rules and 2700
> lcr_rule_targets with 3 priorities.
>
>  
>
> In addition to that, I think the OPTIONS mechanism is just used by the
> lcr module when a gateway is marked as defunct, but the gateways are
> not actively monitored in the normal status. Is this correct?
>
>  
>
> I have been considering CarrierRoute, which has a slightly simpler
> table structure, but I can’t find any other advantage for my use case.
> Regarding CGrates, it looks great but it looks like it exceeds my
> current needs.
>
>  
>
> For those who have implemented LCR in your kamailios, am I missing
> something regarding performance, scalability, etc?
>
>  
>
> Are there any newer modules that can implement this, or maybe just a
> dispatcher-on-steroids setup will do the trick?
>
>  
>
>
Look also at drouting module, the latest version should do OPTIONS keep
alives using keepalive module, otherwise it is a lcr implementation as
well -- I haven't tested myself the keep alive feature, though.

As for me, typically I go in this case for a combination of mtree +
dispatcher. I have mtree translating from longest prefix to a dispatcher
group id, inside dispatcher group you can use priority based routing.
This works just fine even when you end up in several dispatcher groups
with same destinations but different order based on priority per group.

You can even map the prefix in mtree to dispatcher group + dispatching
algorithm, latest version supports having many columns loaded in the
value and then you can use script operations to split.

Cheers,
Daniel

-- 
Daniel-Constantin Mierla
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio Advanced Training - March 5-7, 2018, Berlin - www.asipto.com
Kamailio World Conference - May 14-16, 2018 - www.kamailioworld.com

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