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I have joined this forum after scouring the Internet for two days with no result. I am trying to replace my old door intercom handset. I live in a block of flats which use phones with buttons to open the main door for visitors. The old handset is a Comelit Vox 2000 and I have bought a replacement Comelit 2603u. The firm I bought the new handset from gave a list of comparable wiring diagrams but none matches the original. I have contacted them but they have been no help. Is there anyone who can tell me which wires go where from the old to the new. The attached pics show the connections for the old and the new. Many thanks.