I am using Kamailio 4.0.4 (x86_64/linux).
I wanted to do simultaneous registrations of large number of endpoints.

Many times I see only 2048 endpoints registered and for other endpoints Kamailio did not respond for REGISTER message.

I am tcp as transport.

Now my questions are

1. What are the different configurations available to increase Kamailio performance

2. If I put Kamailio in a Linux 64 Bit, 2GHz, 8GB RAM machine, how much simultaneous and total registrations can be achieved. 

I have tuned system file FDs, tcp related configurations like ephemeral port range, and other required configurations.

I hope there should be some configurations in Kamailio to achieve higher throughput , can somebody help me out.

Thanks

Austin