Just thought I’d update that I was able to get the folks’ wall-phone working with the DSL filter. I had to take the phone apart and remove the sliding male connector on the back and cutting the wires going to it. I then cut a phone cord and stripped all the wires and spliced the like colored wires together. I was then able to plug this connector into the DSL filter plate and then attach the phone. Their DSL installation is now complete!