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How to crimp a cat5 wire to a RJ11 plug

How do I crimp a cat5 wire to a RJ11 plug
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I ran cat5(on advice of an expert?) wire through the attic to add telephone jacks to bedrooms upstairs that didn't have jacks. And because I have to splice it into existing old telephone wire (red/green, yellow/black) I need to put a RJ11 plug onto this cat5 wire to plug into the splitter in the attic.
in that case, just choose two color pairs - say green and blue.. cut the other pair short.

put the green pair on pins 2 & 3 (the two in the center) and the blue pair on pins 1 & 4 (outer pins).

each pair should have a solid color wire and one with a strip (ie.. solid blue and then blue w/ white stripe).

as long as you wire both ends the same way, you shouldn't have any problems.

if you're using single-line analog phones, you only need the pair on pins 2 & 3.
I guess that was my question since the 8 wires do not fit into the RJ11 was it alright to just cut the brown pair off since I realize I am only really using the inner 4 (red/green = blue/bluewhite; yellow/black=orange/orangewhite). Another question....do I have to strip the wires before I put them into the plug to crimp (I have a crimping tool). It looks to me that when I crimp it strips into the wire, but not sure. The attic is hot and dirty and I want to make sure I have everything right the first time. Thanks
no need to strip the wires - place them side-by-side, cut them all to the exact same length - slip them into the plug and crimp.  The crimp plug will 'spear' the insulation and make contact with the wire.