[liftweights]

I have old wiring. Wires coming out of wall are:
Orange, green, blue, black
White/black white/blue white/orange white/green white/brown
Red/blue blue/red

Help! Just want to connect a single line phone jack which has
Red green black yellow wires.

Which ones do I use.

[donf]

Okay, what you are describing is a Cat5e cable. It uses conductors in a twisted pair configuration.

If you are using a 3 pair jack (6 wires), then the blue goes to position 3 and the blue/white goes to position 4. This is the Tip and Ring for a single phone.

If your phone is a 2 pair twisted cable, then Red and Green are Tip and Ring for the phone.

Yellow and Black(under current standards would be Tip and Ring for a second line).

In the days on Noah, the Arc Builder, the Red and Green were Tip and Ring . Yellow was the bell circuit and black was ground.

[Stratmando]

Sounds like 6 Pair UTP,(cat 3?), blue is first pair and orange is second pair.
Hook:
White/Blue to Green, and Blue/white to red for a single line,
Also hook white/orange to black and orange/white to yellow for line 2.

[ebaines]

I agree with Stratmando's suggestion for wiring, although one can never really tell what kind of wiring mess might be present in older homes (in my house for example the orange/white pair is the main line and blue/white pair is the second line - go figure). However, to clarify something - the cabling described by the OP is neither Category 5 nor Category 6 - it's old-fashioned voice grade telecom cable, 5 pairs. The pair order is:

Blue, Blue/white = pair 1
Orange, Orange/white = pair 2
Green, green/white = pair 3
Brown, Brown/white = pair 4 ( the OP wrote that one lead coming out of the wall is black, but I suspect it's really brown)
Blue/red, Red/blue = pair 5.

While twisted-pair Ethernet cable color codes are based on the old Bell System codes, they are limited to 4 pairs, not 5.

[Stratmando]

For years Electricians new to category rated wiring, would use the green/white for green, and orange/white for red, because they were close to the actual colors.
I would go outside, or open other phone jacks and see which is connected to the red and green.
A voltage meter will tell which pair is the phone line, should have about 48 volts DC, and the Green is Positive, and the red is negative with respect to green.