I've installed Kamailio on Ubuntu 10.04 LTS via:http://www.kamailio.org/dokuwiki/doku.php/packages:debs

Updated /etc/kamailio/kamctlrc with: SIP_DOMAIN=MY-IP DBENGINE=MYSQL

I've also installed the kamailio-mysql-modules via apt-get.

Then I've run kamdbctl create and created the MySQL database.

After that I've started Kamailio via kamctl start. Success.

At last I've added two users: kamctl add 100 PASS1 kamctl add 101 PASS2

Everything seems to work, but I've found out that everyone can register and call via the server. Not only the two users/subscribers I've added.