public void DelitingCall(Call call) { this.CallHistory.Remove(call); }
public void AddingCall(Call call) { this.CallHistory.Add(call); }
public void DeleteCalls(Call call) { this.CallHistory.Remove(call); }
public void ClearHistory(Call call) { this.CallHistory.Clear(); }
public void AddCalls(Call call) { this.CallHistory.Add(call); }