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Probably you have two or more phone jacks daisy-chained together. One cable goes to wherever the phone line enters the house and the other runs to another phone jack somewhere else in the house. This is a common practice. I did some pricing online, and it seems that Cat 5e is comparable in price to 4-conductor phone cable, so the builders may simply have ...

Yes, indeed it is a Belgian phone socket. http://www.levoyageur.net/phone-country-Belgium.html The four pins match the four holes in your socket. The firth pin is just there to make sure you don't put it in upside down. There's a hole for it too. This is how it looks with a cover (except for the RJ jack that you may not have) ...

The small black box may be the exterior electronic reader end of your water meter. Trace the wire into the house and if it connects to your water meter then you probably can't do much about that box. You may be able to have it relocated by your water utility. The center grey box appears to be for phone lines and the one on the right looks like cable TV. ...

You can't get rid of the telephone box in the middle. The FIOS connection provides telephone access to the FIOS panel and then the lines running from the FIOS panel to the telephone panel are used to connect all of the phones in your home to the FIOS telephone connection. As for what you can do to make the situation better, I might plant a small tree, maybe ...

This is one of the residential structured media cabinets that you can get at any of the big box stores, made by Leviton and several others (your pic is too low resolution for me to read the name on the phone block, there may also be a name on the cabinet door). You can buy additional blocks of all sorts of things to fit in these, such as network patches, ...

I’m not familiar with outlets in Belgium, but assuming they are typical European outlets, then it looks to be a high-voltage stove/oven or dryer electrical outlet (why it would be in the living room though is beyond me). The labels for the four connectors (a, b, S, ground) are curious, but presumably they are hot (a), hot (b), neutral (S), and ground: ...

High and low voltage conductors in the same junction box must be separated by a barrier. Outdated NEC reference: 800-52(a)(1)c.1.Exception 1. In the typical dbl. gang box installation, power in one half and phone and data in the other, there needs to be a partition in the box separating the two classes of conductors.

First obvious problem- you haven't wired it correctly. You have proven connectivity works with the long Ethernet cable so the fact you are failing to get lights shows that you need to sort this. Also getting signal on all the wires shows something is connected somewhere. Could be a splice as Steven mentioned, or some other problem. Is it even cat-5 cable? ...

We're having to make assumptions here that this is house wiring for an single analog phone circuit (POTS) as no specifics other than "it's a phone extension" are given. This is a four wire cable with a green/red and white/brown circuit. POTS requires a pair of wires. Your house could be wired having up to two separate phone lines if this is the only wire ...

NEC 2008 800.133 Installation of Communications Wires, Cables, and Equipment. (A) Separation from Other Conductors. (1) In Raceways, Cable Trays, Boxes, and Cables. (c) Electric Light, Power, Class 1, Non–Power-Limited Fire Alarm, and Medium-Power Network-Powered Broadband Communications Circuits in Raceways, Compartments, and Boxes. ...