Change the names of your vhost files:
902-example1.com.vhost, 900-example2.com.vhost, 901-example3.com.vhost
Apache will load the first one (900) and make it the default for the IP, then load 901, and 902, so if the IP is used it the web browser it will go to 900..
I myself usually put a _default.vhost file, to do this job.
You cant control this behavour using ISPConfig.
Last edited by tahunasky; 10th March 2013 at 13:49.