[SR-Users] LCR options as of 2018

Francisco Valentin Vinagrero francisco.valentin.vinagrero at cern.ch
Mon Feb 12 13:52:50 CET 2018


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?


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