[OpenSIPS-Devel] LCR-like modules

[Angel Carpintero]

El vie, 29-08-2008 a las 10:39 +0300, Bogdan-Andrei Iancu escribió:
> Hi,
> 
> Following some discussions on the #opensips IRC channel about the LCR 
> module, I will like to push the topic further.
> 
> 
> First, what is the status with the LCR module:
> 
> 1) technical limitations
>       a) linear search through rules - quite slow
>       b) cannot handle large numbers of rules - limited number (in C 
> code) of rules and gateways
>       c) no inbound processing (only outbound)
>       d) difficult to enhanced as it has a bit twisted design - the 
> module was originally designed for DB-only search and later caching was 
> added

Bogdan , i'm agree about LCR limitations ... so as i already told you i
moved my setup to carrierroute , although failover with load balance is
not good enough on carrierroute.

> 2) management issues - there is no maintainer for the module, so 
> development for this module may stale.
> 
> 
> 
> Solution:
> 
> We have a similar module (named Dynamic Routing - drouting) that 
> provides the same LCR functionality (based on rules and GW) and even more.
> Technical adds:

droute module looks that was introduced ( maybe by error in
openser-1.3.2 )

http://www.kamailio.net/pub/kamailio/1.3.2/src/

is the same drouting module are you talking about ?

>     - internal data organized as a search tree - very fast to search 
> through ( O(log(n)) instead of O(n) )
>     - unlimited number of rules and gateways (running on a production 
> setup with 200K rules and with no search penalties)
>     - rule matching may include time intervals and recurrence (when the 
> rule is valid)
>     - a rule may point to set of GWs to be used for (1) sequential 
> selection, (2) random selection , (3) weight selection
>     - inbound processing - prefix and strip for calls originated by the GWs
> 

Looks good ! 

What about adding new rules in realtime ? ( carrierroute is pretty slow
to reload routes "cr reload" ).

> This module is almost 3 years old and stable - it is what we use in our 
> production setups.
> Also, the module already has a nice web interface for provisioning (it 
> will released in the next month, along with an OpenSIPs Control Panel 
> Web interface)
> Of course, we (Voice System) will take care and maintain the module. We 
> will also reduce our burn of maintaining the module privately ;)
> 
> 
> So, the idea is to replace the LCR module with the DRouting module to:
>     1) technical advantages
>     2) maintenance advantages
> 
> 
> 
> I  will like to know the opinion of this (if you find it a good or bad 
> idea), especially from the people using LCR module. Of course I will 
> prepare a more details documentation of this module for a better 
> understanding.

I'm excited with this "new" module , so you have my support to do some
testing and give some ideas.

> Regards,
> Bogdan
> 
> 

Cheers,

- Angel
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