I have an Aspire system that the customer wants to have ring a certain way during day mode operation, but I haven't quite figured out if, or how to do it. Looking for any suggestions.

What they want is for an incoming trunk call to start ringing at a couple of phones, if unanswered after a few seconds start ringing additional phones, if still unanswered start ringing a few more phones, then finally if unanswered go to voice mail.

I currently have it set up to do that except for ultimately going to voice mail. I have ring group one ringing immediately, ring group two as the second ring group for unanswered trunks, and the third group of phones is set up as call coverage keys on an extension of the second group with delayed ringing. Works great - but I can't figure out how to get it to go to voice mail after that.

Sound confusing? It seems so to me, and I think I have probably over complicated the whole issue. But, my head hurts from all this thinking, so I need help!