I have 4 wires in a telephone cable (brown, green,orange and blue)and my new phone jack box has 4 wire holders wired black, red blue and yellow.can someone please tell me which colour matches with which....thanks.

The wires/colors in a category 5e cable run in pairs. They should be tightly twisted together, mostly white with a blue tracer. mostly blue with a white tracer- mostly white with an orange tracer- mostly orange with a white tracer, mostly white with a green tracer- mostly green with a whte tracer, and mostly white with a brown tracer- mostly brown with a white tracer.The jack you have sounds like a standard telephone or cat. 3 jack. If the jack is being used for a standard telephone line, you'll need to connect one of the wire pairs(usually the white/blue pair) to the green and red terminals on the jack.Make sure that the same pair is also terminated at the main telephone junction.

Pity that whoever did your remodel didn't give you a floor plan. In new construction, we make everything go to a central point. Old style was to loop everything through. It would be easy to tell, because you'd see the loops.

If you want to do this yourself, and save some money, give this a try.
The color code is that the green/red/black/yellow go to the jack. Hook all 4 wires (8 because you're going to hook both cables together to a jack) to the jack. Then, down the road, when someone has to add a second line they won't have to open this back up again. When it comes to the paired cable, look at the wires. One of the wires has more white than blue (White/Blue lead) and one has more Blue that white (blue/white lead) and so forth. You're going to be working with the blue pairs and the orange pairs, and spare out the green and brown pairs.

Strip the 4 remaining wires (the ends so they can go on the screw terminals) and connect them as follows:

White/Blue to Green Blue/White to Red White/Orange to Black Orange/White to Yellow.

If you're using Insulation displacement jack (the kind with caps where you push the wires into the slots), STOP! You're going to need more parts.

TPH553 T568A T568BPin 1 - BL White/Green White/Orange Pin 2 - OR Green Orange Pin 3 - BK White/Orange White/Green Pin 4 - RD Blue Blue Pin 5 - GR White/Blue White/Blue Pin 6 - YL Orange Green Pin 7 - BR White/Brown White/Brown Pin 8 - WH Brown Brown
REF: wikipedia

dialtone should go on the green and red wires of the jack for 1 line service, yellow and black for a second line.
Depending on the type of wiring that your dealing with the color code can change. if your wiring has white wires with little dashes of color on them then the code is:
green = white/blue (mostly white with blue dashes)
red = blue/white (mostly blue with white dashes)
black= white/orange (mostly white with orange dashes)
yellow= orange/white (mostly orange with white dashes)

the RJ45 wallplate is not meant for ethernet. It's an 8P8C connector for a phone. Will it work as a network jack? Maybe. I wouldn't use it, but if you really want to try, wire it thusly:

1 Blue --- Orange/White
2 Orange --- Orange
3 Black --- Green/White
4 Red --- Blue
5 Green --- Blue/White
6 Yellow --- Green
7 Brown --- Brown/White
8 White --- Brown

I'd still recommend a CAT5 wallplate with a CAT5 jack.

What color wires were there ???
What kind of jack, a new one that had...
white blue/blue
white orange/orange
white green/ green
white brown/brown
?????

If so, the white/white blue would go to the same wires.
If you had red/green and black/yellow, the red/green should go to the white blue/blue.

568-B Wiring
Pair Wires RJ-45 pins
1-White/Blue White/Blue 5
Blue/White 4
2-Wht./Orange White/Orange 1
Orange White 2
3-White/Green White/Green 3
Green/White 6
4-White/Brown White/Brown 7
Brown/White 8
568-A Wiring
1-White/Blue White/Blue 5
Blue/White 4
2-White/Green White/Green 1
Green/White 2
3-White/Orange White/Orange 3
Orange/White 6
4-White/Brown White/Brown 7
Brown/White 8
RJ-45 Pins are with the spring tab down and read left to right. Do you have an RJ-45 Crimping tool?
Just use 568-B or 568-A on both ends of the same cable.

Pin Std Phillips
1 White/Orange BLUE
2 Orange Orange
3 White/Green Black
4 BLUE Red
5 White/Blue Green
6 Green Yellow
7 White/Brown Brown
8 Brown White

I know this is an old thread, but for the sake of helping someone else in the future, I just got off the phone with the Phillips Help Desk and this is the way they told me to wire it up the RJ-11 & RJ-45 combo jack I bought (PH60037):

• RJ-45
• Jack colors - CAT 5e
• Blue - white/orange
• Orange - Orange
• Black - white/green
• Red - Blue
• Green - white/blue
• Yellow - Green
• Brown - white/brown
• White - brown
• 
  
  RJ-11
• White - white/green
• Black - white/orange
• Red - blue
• Green - blue/white
• Yellow - orange
• Blue - green

He said it was the standard configuration used by the phone companies for some time.
Phillips Help Desk # for phones/PCs (800-233-8412)
Hope that helps someone else down the road.

Thomas