Is it possible to have a second call ring on a phone while the person is on a call already? Similar to call waiting? For example, our receptionist is one the phone, a call comes in. Right now she doesn't see it at all, it just goes to the other phones in the ring group. What we would like to happen is for the call to ring on one of the other line buttons on her phone since there are 6. I tried messing around with the phone busy settings but it didn't work.