I got this item to make two phone lines coming into my house work together, one line was a pots line, the other was a digital phone service from Comcast. I trued to split my phone line up since I have cat6 for my phone lines through the entire house and also a single cat 6 line to each jack. They all converge in a wire closet and even using the spliter and some other engineering I could not get them to work. Don't know if it was me or what i was trying to do but if you just need to get 3 jacks from 1 then this will work.
PROS: Good for turning a single jack into a 3 way.
CONS: Dont get this if you want it to split a multi line system, thought it would work and it did not, had to come up with another plan.