"Three different DECT phones"
Is that "Three different BASE units" (each with "cordless DECT handsets") connecting to the phone line?
"One BASE unit" with three cordless DECT hand sets?
I have two working Base units, the older one having three identical handsets designed for it.
The other newer different Base unit has one handset which came with it; and two intermediate age handsets which originally had their own Base Unit.
The newer Base Unit has an Answering Machine facility etc, which works fully with its own single hand set.
Whilst the two intermediate handsets are working on that newer Base Unit for basic facilities; but do not handle the additional AM etc.
Another aspect is that those two handsets do display the incoming numbers (and names) if in their own directories, if one attempts a recall of earlier incoming calls etc, "Not available" appears on their displays.
The newer Base Unit and associated handset were a "blindly-bought" Christmas present, hence the complications and convolutions.
Whilst experimenting to reach the present configuration, I also had the intermediate Base Unit working.
During that relatively short period, with three Base Units working, I did not observe any untoward whistles etc.
This may or may not have been that in effect, all of the internal PHONE side comes through one VDSL Filter at the ancient Master socket, then each working/employed phone socket around the house also has a VDSL or ADSL Filter as well.
So all the working PHONE connections are double-filtered.
The BB connection is by an Ethernet cable, from the Master Socket VDSL Dangly Filter, "direct" to the EE Brightbox 2 Modem/Router.
Edited by eckiedoo (Sat 04-Mar-17 16:39:31)