best make a photo of the box, a picture says more than 1000 words.
If there are article nimmers on it, these may be written separately in the post.
Mostly, telephone and IT installation are separated over 2 cables (at the top of the same pipe). Then from each can a cable would lead to the telephone rail and a cable to the IT rail in the box.
However, as soon as Y-cables speak, the alarm bells usually ring, which as long as gigabite is not driven, it is possible to use a cable “double” and to guide both phone and IT through the same cable.
But I also see the ghost 🙂
Here is a Link with a good illustration of how to connect.
For the solution of Herby it would be page 6/7.
With only one tel and existing filter as it seems to be useful to you page 5
PS: if an admin finds the post here please move to the corresponding Chanel;.)