I ran into this same problem a few days ago. 568b will not work. Even though on the actual phone system they have the larger plugs that will work with the RJ45 plugs, they do not terminate 568b. You will need to terminate the jacks USOC. The pinout will be below.....

3 - White/Orange
4 - Blue/White
5 - White/Blue
6 - Orange/White

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