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Hello - need some advice on how to wire a new extension socket, if anyone knows how?

This is the current master socket in my house - the main feed wires are white and orange, and punched down into number 2 & 5 The other wires in the master (which appear to be older specification), are red, blue, black and yellow. These are the connections which run to the current extension socket: This is the new socket. I have new telephone cable, and just need to know which number sockets the cable needs to be punched down into, in the master and new extension socket. Any help much appreciated. The extension socket is currently in my little boy's bedroom, so I'd like to get the broadband router and telephone out asap. I'd completely do this on my own, if it were already newer cabling, but as it isn't, I don't want to stuff it, and our telephone connection up!

2, 5 & 3
same colour at each end (It doesn't matter what the colours are)

+1. The cable colours are immaterial. 3 is the 'bell wire'. If you don't want the telephone to ring in a certain room then don't connect Pin 3, or bypass it. Telephone cables [allegedly] have to be connected in Series. i.e. From Master to extension, to extension, etc.

However, I did once connect one in parallel, and it still worked.

Grumps, the actual cables run in a chain, one after the other, while electrically the cores inside are actually in parallel. the old dial phones used to have the bells in series.

jhreaside....As others have said, just follow existing colours to numbers scheme that already exists. 2-2-2-, 3-3-3-, 5-5-5-5 etc. The other pins/numbers don't do anything( in a "normal" home system anyway) so are not required.

However, I must point out that the cable you have is stranded cable designed for alarm systems. It has stranded cores, which while they might work are not ideal for the punch down/IDC connectors you have in your socket, which are designed for solid cores. There is probably no "twist" in it either( or if there is I don't know which pairs) so it's not great for broadband over long runs.

The "new" master sockets are better for Broadband too, as they contain filters to reduce RF interference. Only the one with the (bell) capacitor in is the master, the others are extension sockets.

If you don't have one of the special tools, an old credit card or similar works very well as it is stiff enough to push the wire down but won't damage the contacts. No need to strip the wire, but it's a good idea to trim the ends to prevent any accidental shorts etc. later on.

So any 3 of the 4 coloured wires of the new telephone cable, will be fine so long as it's the same at the master and extension end?

Yes

This all worked out well - I never said thank you for all of your help.