Eircom Socket Dual Faceplate Query

Can someone just confirm something for me quickly?

We had phone line issues and Eircom came and fitted a faceplace on the master socket which now has two sockets - phone and DSL. Obviously this removes the need for the filter that we used to have hanging out of the old single socket.

However am I correct in saying that now all other phone extensions in the house are automatically DSL filtered and not longer require the plug in adaptor?

Thanks in advance.