If you are in the middle of a telephone conversation and another call comes in, this call will be shown and a call waiting tone (not actually ringing) will be played in the active conversation. This procedure is known as Call Waiting. You can now decide whether you would like to put the current call on hold in order to take the second call or whether you would like to continue your call without interruption. If you take this call, the call which was just active will be put on hold and the incoming call becomes active.