What is an ADSL Filter?
An ADSL Filter is a small device that splits one end of the phone line to use with ADSL and the other end to use with a phone handset. You will need an ADSL Filter if you only have one PSTN wall socket, as you will need to plug in both your router (ADSL) and Voice Box 2. ADSL Filters range from $10 to $25. An ADSL Filter may have been provided by your ISP or even installed internally. If one has already been installed or you are not sure, please check with your Internet Service Provider (ISP) for details.