Yes, only one base is now shown in that menu.
I think that it’s possibly then an incompatibility problem. If you go back to the compatibility table that I posted earlier, then the Mk1 versions of both BeoCom 6000 and BeoCom 2 are shown as incompatible with Beoline Mk2. In practice they will often work as basic phones but with some limitations.
I also found I had a Beocom 6000 pyramid PSTN, so I tried to connect the Beocom 5 to that too. Same result – it continues to search for the base, but it doesn’t find it (and yes, the base is in discoverable mode).
The BC6000 Mk1 is fully compatible with the pyramid PSTN. Have you tried resetting that base and then registering the BeoCom 5?
Location: Warwickshire, UK
My B&O Icons:
