I want to buy a Hikvision DS-KV6113-WPE1(C) doorbell. I will connect the DS-KV6113-WPE1(C) directly to my network with an UTP connection. But I want to connect one way or another my old dingdong doorbell also to it. So when I am at home the dingdong also goes as there is someone at the door. Is that possible and to what contacts do I connect the dingdong in what way? Does anybody know that?