The standard for telephone cable is as follows (1 through 50):

White/Blue (WIDE White stripe, narrow Blue stripe/commonly referred to as "TIP")

Blue/White (WIDE Blue strip, narrow White stripe/commonly referred to as "RING")

White/Orange

Orange/White

White/Green

Green/White

White/Brown

Brown/White

White/Slate

Slate/White

Red/Blue

Blue/Red

Red/Orange

Orange/Red

Red/Green

Green/Red

Red/Brown

Brown/Red

Red/Slate

Slate/Red

Black/Blue

Blue/Black

Black/Orange

Orange/Black

Black/Green

Green/Black

Black/Brown

Brown/Black

Black/Slate

Slate/Black

Yellow/Blue

Blue/Yellow

Yellow/Orange

Orange/Yellow

Yellow/Green

Green/Yellow

Yellow/Brown

Brown/Yellow

Yellow/Slate

Slate/Yellow

Violet/Blue

Blue/Violet

Violet/Orange

Orange/Violet

Violet/Green

Green/Violet

Violet/Brown

Brown/Violet

Violet/Slate

Slate/Violet

In cables of more than 25 pairs (50 wires), the first bundle will typically be "bound" with

White and Blue plastic strips or cloth threads.  The second would be bound with

White and Orange, and so on.....see a pattern here?...  There are other variations

for binders in some specialty cables, but normal "voice" cable will follow the above

pattern.

Beware of Red/Brown and Brown/Red as some cable manufacturers colors are not very

distinct.