With due respect, and doubtless I get get pilloried by the majority demographic (on here anyway), but extension wiring….like it’s 2023. It’s so niche no ISP other than good old A&A can be bothered dishing out instructions.
Totally fair point.
However it's worth noting that telephone extention wiring kits have continued to be a staple item in DIY stores over recent years, which suggests there's been some demand.
There was also the advice about ensuring people have a wired phone alongside their cordless one in case of a power cut (advice which is defunct in a post-PSTN world!), and some suggestion (or was it even in the building regs for new builds for a period?) of having a wired extension upstairs.
There's also the somewhat niche but quite real issue of buildings with thick walls.
I can well imagine, as the switch to DV goes on, some people being quite surprised that all their intricate home extension wiring suddently means nowt (unless they opt for a voice reinjection solution).
That said, it's easy to see it all becoming a relic of the past in households, a bit like disused gas piping to rooms for gas fires, or in grander properties (perhaps subsequently converted to flats) the remains of maids or servants call bell systems.