How to extend the distance of a phone line?

I have been asked to extend a phone line.  Someone drug a CAT5 cable to the gang box where the current insert is sitting to a new gang box on the other side of the room and they asked me to terminate the lines for them.  The phone line is using a CAT3 cable with Blue and Orange as the line pairs.  It is an Avaya Partner system.  How do I splice this line to the Cat5 line and extend it's length?
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Ideally, you would have some small plastic splicing caps.  However, in a pinch, you simply cut the two lines, strip them, and twist the same colors together - blue/blue, blue white /blue white, orange/ orange, orange white/orange white.  You'll need SOMETHING to insulate the splices - you can use electrical tape if necessary.  Once the wire is spliced, simply extend to where you want it to go, and re-terminate.

Note, this is NOT a best practice - to splice "horizontal cabling".  Ideally, you'd pull a new cable to the new location and either leave the old one for "future use" or uninstall it.

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strescoAuthor Commented:
Thanks for your fast reply, however this is what I did to accomplish it: Terminated new insert on existing connection to PBX using Orange and Blue pairs.  Crimped RJ11 plug on one end of CAT5 cable in the following order Orange/White-Blue/Blue/White-Orange.  Terminated new insert on CAT5 cable on far wall.  Screwed blank plate on single gang box to hide the ugly, screwed in double insert plate on new end.  Line spliced and extended.
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