With provisioning on, the basic way is in your CP, select the Server Configuration the Advanced configuration. The four different regions have different servers.
If you have provisioning off, you would enter into one of the config screens of your ATA. Can't remember which one right now.
reply to DaveDude If you have a viatalk provisioned ata go to control panel. Look for advanced features. Click on server config. Select different server.
If you have the admin password or your own ata just simple change server names under line 1 or line 2.