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Install line filters

If you have an AT&T Internet service and traditional home phone service, learn how to install line filters for your phone lines to prevent noise from disrupting your service signal.

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Filter Installation

Line filters prevent home phone service noise from disrupting your internet service signals. Depending on how many devices you have in your home, you may need more filters than what was included in your installation kit.  To order additional filters, please visit the AT&T Equipment Shop.
  • If you have digital phone service, or you have AT&T Internet but don’t have traditional home phone service, you won’t need line filters.
  • Line filters shouldn’t be connected to your modem or gateway unless you need to connect your modem and another device to the same wall jack.

Single-Port filters
Single-port filters connect one device such as a phone or fax machine to a wall jack.  Installation is simple:
  1. Unplug your existing phone cable from the wall jack.
  2. Plug a single-port filter into the wall jack.
  3. Plug the existing phone cable into the port on the filter.
Single-Port Filter

Dual-Port filters
Dual-port filters are used when you are connecting your modem or gateway and a second device, like a telephone, to the same wall jack. To install a dual-port filter:
  1. Unplug your existing phone cable from the wall jack.
  2. Plug a dual-port filter into the wall jack.
  3. Plug the existing phone cable, which is connected to your telephone or other device, into the filter port labeled Phone.
  4. Plug the data cable from your modem or gateway into the filter port labeled DSL/HPNA.
Dual-Port Filter

Wall-Mount filter

If you have a phone that is mounted to the wall, you’ll need to use wall-mount filters.  The wall mount filter is installed between the original wall plate and your wall-mounted phone. To install a wall-mount filter:
  1. Remove the phone from the wall jack by lifting it off the wall pegs.
  2. Unplug the existing phone cable from the wall jack.
  3. Plug the phone cord from the wall mount filter into the wall jack.
  4. Mount the filter on the wall plate pegs.
  5. Plug the existing phone cable from your telephone into the wall-mount filter.
  6. Attach the phone to the mounting pegs on the front of the filter.
Wall-Mount Filter

Note:
This type of filter is not included in your AT&T installation kits, but they can be purchased at the AT&T Equipment Shop.
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