I have an hunt group configured in IP Office 406. It has two extensions in it with one overflow group. Ring mode is collective, voicemail off, overflow time 15, queuing is off. There is a phone outside our door that when a person picks up the phone calls this hunt group to tell the receptionists to open the door. One receptionist is out on maternity leave so her phone is on call forward. If the other receptionist is on a call the outside phone gets a busy signal. I tried adding a third extension to the extension list and it rolls over to that new extension. Is there a way to make a hunt group ring her second line if she is on her first one already?