Asterisk based auto dialer test and verified by 300+ concurrent. 

1-Downlpad all packages. 

2-from database/mysql.sql import to mysql server. 

3-copy the engine directory to a local directory, edit dialout.php for mysql user/pass. 

4-copy web directory to www of your servers. 

5-configure crontab with given file. 

6-copy the configs of asterisk to your server.