I set up category 5 sockets. On the other hand, I tightened the pins that will go to the switch. Wire pair connections checked with an inexpensive tester from the auction site. Everything Ok.
However, I have a problem with the additional socket that was supposed to be used as a telephone socket. Berker UAE 8-pole Cat.3
The socket looks like the picture, only it is single. In the upper part of the socket there are numbered terminals where the wires are tightened with screws. From right to left we have 1,2,3... to 8.

I installed all plugs and previous sockets in accordance with the T568B standard.

Here I also did so, connecting according to the diagram:

To clamp 1: white-orange, to clamp 2: orange, to clamp 3: white-green and so on.
The problem is that the tester does not light up when checking it as if there were no pairs connected. I think I connected the cables correctly? Maybe I am wrong and there is a mistake.
Now all I can think of is to ring the wires in the twisted pair and check for continuity.