I would think you could do it in a couple of ways.
1) put a unique key appearance for each call group on each call groups members phones and then build a circular hunt group with those keys as members. Ring the door bell to the hunt group.
2) Create 3 phantom phones, then create personal ring groups for each one, put each of the group members in the ring groups. Then put the phantom phones in a circular hunt group and ring the door bell to it.
Ralph