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I grant that there are less nice DECT phones than there used to be. There also used to be DECT adaptors for regular phones (RJ11).
In the past I ran a long cable back to POTS port and a T splitter for the DECT, so as to have a conventional desk phone. Actual analogue phone system uses CAT3. Likely 500m of CAT5 works. Best to fit UK to RJ11 adaptor with a capacitor in it if using a UK spec phone.
It's also possible to wire the gubbins of a desk phone to the internals of a DECT phone, except some additional electronics is needed.
A DECT extender for a FAX has RJ11 POTs port (never seen the UK BT version) and will work with a regular phone.
There even used to be 64K data adaptors, as DECT uses uncompressed 64K, hence a Fax worked.
Your actual POTS port (or DECT host) on a router connected to a fibre modem may or may not support Fax or analogue modems, depending on ISP and which codec they use for VOIP. I have managed in the past to use Fax and data modems (19.2K max) over VOIP on a microwave link, but the ISP had their own VOIP / PSTN gateway.
I got switched from that to fibre only in Oct 2023. The current Router is a Fritz!box with a built in DECT as well as regular POTS port. I have my DECT base (from 2008!) plugged in to the regular phone port as re-pairing DECT handsets is arcane and makes stupid BT seem simple.
Back in 2007 we tested loads of VOIP Wifi phones and compared with DECT phones. The DECT was superior range and standby and quality, so we supplied Dual DECTs free with every router as it was not Fibre or DSL modem (I worked for an ISP doing R&D) and we wanted folks to use our system for calls rather than analogue alandline. Ours was cheaper for national and free for local anyway.
Check German stores like Conrad online?
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