How to Troubleshoot a Phone With DSL

Remove the DSL cable from the telephone jack, and insert the clip end of the filter into the telephone jack.

Insert the DSL cable into the "DSL" port on the filter.

Insert the telephone cable into the "Line" port on the filter.

Unplug the DSL modem and wait 15 seconds to power-cycle the device. Plug the DSL modem's cable back into the electrical outlet.