... the purpose of the filter is to prevent DSL tones from disrupting telephone conversations.
Radio frequency 'tones' do not create audio tones to disrupt telephone conversations.
POTS appliances (ie fax machines) will 'eat' (diminish) radio frequency tones if not blocked by a DSL filter. Any filter between a home ADSL modem and IPS' DSLAM will only obstruct radio frequency tones. That modem must connect directly to the DSLAM.
