don't think you can fit a telephone in a chint CU. LOL.
I once fitted a telephone in a coffin.
I owned a company that made flightcases & rented the top floor from a bloke who had a Shopfitting business.
This bloke decided to try to diversify & find other markets for his skills & machinery, & so bought a coffin to see how it was made & if he could make them competitively. The answer was that he couldn't, so his plans came to nothing & he was stuck with the coffin that he'd bought.
We, upstairs had some noisy machinery - saws to cut aluminium extrusion, saws to cut wooden panels, an air compressor, air drills & rivetters etc. and it was often difficult to have a conversation on the workshop telephone.
One day, I had a brainwave & nicked the coffin, dragged it upstairs, stood it up on end, fitted a shelf in it across its widest point, lined it inside with foam to soundproof it a bit & stuck the telephone on the shelf inside it. It worked perfectly as an acoustic telephone booth !!
The same coffin was used as a makeshift desk for the VAT inspector to work on when he came to do an inspection on us - we even fitted it with a nameplate with his name on it !! That was the first & only time he came to see us !!