Is there a way to put in one dsl filter?

[ingeborgdot]

I will be using this setup for the phone and it will be having DSL. Is there anything that anyone knows would work to Put one DSL filter at the beginning of this to eliminate the need for filters throughout the house?
http://www.openhousesystem.com/product_detail.php?productId=20

[ingeborgdot]

Could you clarify on this?  My brain ceased to function.  1 filter per line?