[cisco-voip] Help: Problem on AC Hunting System

[Ciscozest]

I configured a Hunting group in CCM 3.3(4). the members are: DN 4701, DN 4702, DN 4703, and DN 8000 (voicemail). I use 
longest idle algorithm. Whenever I dial to the AC pilot, it went to either 4701 or 4702 or 4703 then to voicemail. What 
I want is to route the call to any of user DN then if it is not answered/busy, the call will be routed to another user 
DN and eventually to the voicemail. Can this be done? Also would like to know how to set ringing timeout for this 
hunting system? Thanks

regards,
Robin