Advertising network failover?

Is it possible to have an advertising network failover? For example, I have Chartboost ads showing as my highest priority on a certain screen… but if there’s no ad available at that time it fails over to my second advertiser Revmob.

Why we have a tutorial for that:

http://coronalabs.com/blog/2013/11/19/tutorial-using-multiple-ad-networks/

Rob

Why we have a tutorial for that:

http://coronalabs.com/blog/2013/11/19/tutorial-using-multiple-ad-networks/

Rob