Ring Intercom and Urmet 1122/31

HiI'm trying to connect Ring Intercom with an Urmet 1122/31 kit .It's a 2 wire intercom.In the compatibility list, there is a 1122/1, but it has to connect to 5 wires and the codes, except for 1 and 2, are missing in my case.I tried to connect only A1 and A2 to 1 and 2, but when someone presses the outside button, nothing happen.Instead, if I pick up the internal phone, it's like someone presses the buttonBelow, you can find a picture and the official connection schema.Can you please help to understand if it will ever work?Thanks[Link to Urmet 1122/31manual](https://www.urmet.com/FileDownload.ashx?idDocumento=507956&estensioneFile=pdf&tipoDocumento=libretti&azienda=Urmet)