John called. He asked for you to ring him back as soon as you arrived.
If you ring someone back, you phone them either because they phoned you earlier and you were not there or because you did not finish an earlier telephone conversation. Tell her I'll ring back in a few minutes If there's any problem I'll ring you back
1 The tone heard at the calling party's end when the called party's phone rings 2 A signal used by an operator at the receiving end of an established connection to recall an operator at the originating end
The tone heard by a calling party when, at the called-party's end, the telephone is ringing or the system is otherwise being alerted of the incoming call
The sound that you hear over the phone that indicates that the phone is ringing on the other end, and not busy It sounds a lot like a phone actually ringing