Is an in-line filter needed when I connect the CapTel 800i to a DSL line?
For the best sound quality, all telephones including CapTel 800i should be plugged into a DSL filter in your home. Your DSL provider should give you enough filters for all your telephones. While an in-line filter is not technically required for the CapTel 800i, it will improve the sound quality of your telephone calls overall.