[SR-Users] Nat problems

David Zambrano dzambrano at gmail.com
Fri Sep 2 22:33:17 CEST 2011

Hi andrew. Thanks for your help. What module or config should I use to make
sure the connection goes back through the loadbalancer?

For the failover I didnt specify anything ping related. Im using the
dispatcher module. Can I specify the ping config in that module or should I
use another module for that?
On Sep 2, 2011 2:24 PM, "Andrew Pogrebennyk" <apogrebennyk at sipwise.com>
> On 09/02/2011 08:58 PM, David Zambrano wrote:
>> After doing some traces
>> on the network I realized that the transcoder is trying to reach the
>> router in front of the softphone and skipping the Kamailio
>> loadbalancer. The call never reaches the softphone so the phonecall
>> never completes. In UDP exactly the same thing happens, the call skips
>> the Kamailio loadbalancer but the call completes perfectly fine.
> Well, you can not open the TCP connection to the client behind NAT. You
> need to reuse the existing connection created during registration, so
> the request should go via load balancer by record-route or path. I'm not
> sure why this works for UDP, probably your router is too permissive in
> this case :-)
> Regarding the loadbalancing and failover, I don't understand what is the
> problem. Could you specify which lb module do you use and preferable
> post the part of config responsible for failover. I believe you don't
> need to send request to both transcoders. To skip the transcoder that
> goes down you need to setup ping checks, if that is the only problem.
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