the Comelit Vox 2000 was an old and existing installation that used to work. It recently had noisy (noise from the speaker i the handset). there is also a red button on the handset you have to press in order to speak. In the Urmet 1133/15 there is not a a similar button when you have to speak.
I have replaced my old door intercom handset. I live in a block of flats which use phones with buttons to open the main door or visitors. The old handset is a Comelit Vox 2000 and I have bought a replacement Urmet 1133/15. I have attached a list of comparable wiring diagrams given by Urmet. The...