I have an incoming call route of the main number going to a hunt group for the receptionist. The call comes in via the PRI. A call comes in and the receptionist conferences the caller to an outside line the the bosses cell phone. When a second call comes in, the calling party gets a busy signal. Whenever a conference call is in progress she can only get 1 call. Every other type of call works fine and she can get as many calls as he has appearences. Any ideas?