[SR-Users] A Couple of Questions about carrierroute moduel

[marius zbihlei]

JR Richardson wrote:
> Hi All,
>
> I'm testing carrierroute module on version: kamailio 1.5.4-notls (i386/linux).
>
> I'm distributing calls to a group of Asterisk servers, all in the same
> carrier and domain, wanted to load balance the calls and I'm curious
> how this works.  I see the 'probability' parameter in the carrierroute
> table and set it to equal value across all servers, I have 4 servers
> I'm sending calls to, so I set each prob value to '0.25'.  I'm testing
> with sipp  and hashing over call_id so this is the same for every
> call.  I send 40 calls and the distribution of calls to the asterisk
> servers are 11, 12, 6, 11, pretty close to even but not 100%
>   
> How does the distribution algorithm work for carrieroute?  Does it
> statefully track all active calls and load balance across each server
> in destination group?  Is there another algorithm that can offer that
> can get closer to a round robin effect?
>   

Hello JR,

The distribution algorithm works by doing a CRC32 on the Call_id(I 
suppose you use cr_route not cr_prime_route), and dividing than number 
so it reflects the probability you gave . Your data sample is too small 
to show the correct distribution; if you can test with a 2000 calls 
scenario, and the Call-Id is randomized as it should, then the 
distribution will be uniform. The carrierroute module does not keep 
track of balanced calls.
> Another question is do I need to include the record_route() and the
> t_check_trans() functions prior to calling the carrierroute functions?
>  I see in the debug "DBG:core:forward_reply: found module tm, passing
> reply to it" and dialogs seem to process fine, so does the
> carrierroute module handle those requirements for stateful processing?
>
> Thanks.
>
>   
AFAIK, the decision to call record_route() is orthogonal with the 
carrierroute module. The same for stateful / stateless processing (you 
can use carrierroute module both stateless or statefull depending on 
what you want)
> JR
>   

Cheers
Marius