Incoming line (black,blue,orange,white) via cat6 to RJ12?

Hi all, I've got the incoming black telco wire connected by electrician to a length of solid core cat 6 UTP down to my cabinet where I want to wire it with an RJ12 connector to plug into my router.

The electrician connected the incoming wires to the cat6 in following config...

(Incoming --> Cat6):

Black --> Brown/white

Blue --> Brown

Orange --> Yellow

White --> Yellow/white

Trouble is I can't find any reference to which of the incoming colours should correspond to standard RJ12 colours... i.e.

Yellow, Green, Red, Black.

Anyone familiar with that set of incoming colours?

Thanks heaps.

Jon