Here is the setup I have configured.

  --Two Kamailio K1, K2 Works as a registrar and call load balancer

  -- Three freeswitch works as the media server.

 -- They follow common MySQL database.

 Regular call flow 

  User A---> Kamailio (K1)---> Freeswitch (F1)----Kamailio(K1)--->User B.

Everything works fine as long as all users are registered and making call with single Kamailio. Now the problem starts when we distribute users on more than one kamailio.

  Let us take the case.

   UserA -- Registered over TCP with Kamailio (K1)

   UserB -- Registered over TCP with Kamailio (K2)

Now User A initiates a call.. It will follow the same path

User A---> Kamailio (K1)---> Freeswitch (F1)----Kamailio(K1)--->User B.

Since User B is registered with K2. K1 being a public server won't be able to initiate any call to User B because there is no TCP connection established with it.

 Can anybody shade some light on this?

Thanks,