Crystal Cisneros

Is there a way to have for example… A group of 5 agents. Where agent 1 and agent 2 receive calls… then if both agent 1 and agent 2 are on the phone…. agent 3, 4 or 5 get the call? I'd like to have agent 1 and 2 receive all calls first if available then it go to the rest if not the next agent available… 

I'm having a hard time finding out if this works for me. How do we find out if it's working or not?