An addon is typically used for pointing to another folder to display as an entirely different website.
A redirect will simply change the name of the domain in the address bar to the main domain. (example, domain1.com is the main, domain2.com redirects to domain1.com. domain1.com displays in the browser address bar for the visitor.)
A parked domain, by default, will allow you the behavior you are wanting. (domain1.com is the main, domain2.com is parked and pointing to domain1.com. domain2.com will display in the browser address bar for the visitor.)
Many content management systems (such as Concrete5) override the parking behavior. This would be a result of the way they are coded and not anything that could be overridden in the cPanel.
Still, give the parked domain a try. If the Concrete5 allows, it should work as you desire.
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