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If you have not rewired your premises with a Home Run Line (a dedicated wire run from your outside wiring interface complete with filter), then you need to ensure every phone using appliance in the house is filtered. Not only phones, but fax machines, alarm systems, TV converter boxes etc.
Do not wire your DSL modem through an analog phone modem. It will not work.
Be wary of UPS surge protectors for phone lines. Some will work some won't.