Using defunct phone extension as a network cable?

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I have several phone extensions from various rooms to the main master socket in my hall, where my router plugs in. I plan to disconnect these as they're not needed. However I could do with wired ethernet to my office and I'd rather not pull up floorboards, etc.

Since my router is sitting next to one end of the extension, which is already pre-wired to a socket in my office, I'd love to be able to use this as a network cable. But I can't figure out what adapters I might need. When I Google I get loads of adapters that look like they'd physically fit the cables but they don't appear to do what I want. RJ45 is used in many different ways, and there's issues regarding twisted-pairs - this is the limit of my knowledge to realise I don't know enough to understand what I need!

What I'm ideally after is to plug a network cable into my PC, and into the telephone socket in my office, via some sort of adapter presumably. And at the other end, I disconnect the phone cable from the 'junction box' and plug it into one of the ethernet ports on the back of the router, again presumably via an adapter. My PC and router both think they're connected via Cat5 ethernet, but the transport is done over a phone cable (less than 10m length).

I'm aware there might be some signal degradation(?) but I don't need gigabit speeds here, the limiting factor of my internet connection is only ~30Mbps and realistically if I can achieve 10Mbps that'd be fine.

So can someone give me a brief overview of what's needed here?
 
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I use these for connecting cctv dvrs to the network ( with cat 5/6) very easy to use and may be worth a go on your BT cable
 

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