I am a newbie who started working on Kamailio only few days ago. I am trying to setup kamailio in such a way that kamailio acts as a load balancer for 2 or more asterisk systems.

i have following queries. 

1.  As i understand , all the SIP registration will be done with Kamailio and the Media of the calls will be routed to Asterisks in a round robin fashion. In such a case , is it required that all the extension  numbers to be used are to be configured in all the asterisk systems included in the setup ?

2.  If extension 1000 is in asterisk1 and extension 1001 is in asterisk2 , then is it possible to make internal calls between these extensions ?

3.  Is it possible to have TLS based registrations to Kamailio 

4. My plan is to build a system which can handle 10000s of extensions . So the system is supposed to be scaled up by adding more asterisk servers in order to accommodate more and more extensions as required . 

THanks and Regards

Abdul Rasheed