I've just installed cat6 cabling and an xdsl master filter to a patch panel in my roof space - so far so good and BB faster and phone clearer. However in one room I can only pull a single cable (I used the old phone line to pull through the data cable but there's not enough clearance to get a second cable through to allow me to re connect the phone).

So - my question - can I mix phone and data on the same cable?

My understanding is that only 2 of the four pairs are actually used to carry the data signal, with blue and brown unused. Therefore in theory I think I could remove the blue pair from the cat6 keystone and connect it to the phone jack, and do the same at the parch panel end.

Would what I've described work?

Any advice or opinions gratefully received. Cheers.