asterisk users - Dec 2004 - Balanced call distribution to agents logged into multiple queues.

Here's the scenario, 5clients, each client has their own queue.  There 
are 3 agents, and they're all logged into all of the queues.  Using 
round robin or rrmemory an agent can get a call in queue 1, then hang up 
and immediatly get a call for queue 2,3,4,or 5 while the other 2 agents 
have not gotten a single call.  How does one make it so that the round 
robin feature round robins to every logged in agent.  So that, whoever 
gets the call was the person who least recetnly got rung.

Thanks,
-Ryan