Also be connected to the phone line through an ADSL microfilter. One filter is required per. BT-830 ADSL Phone filter should be used on the end of every extension coming from the master. BT Plug to BT Socket.
ADSL FILTER MICROFILTER SPLITTER BT UK INTERNET BROADBAND
ADSL Broadband Microfilter BT Plug to RJ11 Internet Phone Splitter Modem Fax
ADSL/ADSL2+ Microfilter Internet Broadband Micro Filter Splitter With Cable Lead
ADSL Filter Microfilter for Broadband/Phone, Compact Standard UK Size, White
