If the problem doesn’t occur when you’re connected to the Telephone Network Interface, the trouble is inside your home. It could be caused by a connected DSL filter or from interference from electronic devices in your home.
Check devices connected to DSL filters
If the problem occurs with one phone, and it’s connected to a DSL filter:
- Check your DSL filters: Turn off or unplug your modem. If the issue went away, then a DSL filter is likely the problem.
- Identify the failed DSL filter: Unplug one filter at a time from the telephone jack (wall). Leave the DSL filter you just unplugged attached to the device. Use another phone and DSL filter on a different jack to see if the problem still exists.
- Test your devices: Plug in all of your DSL filters and devices, one at a time. Perform a test after each device is added. If you still have the problem, it is likely the phone, fax, or other device is defective. Remove or replace that device.
Check your electronic devices
We suggest using a corded phone for this test. If you use a cordless phone, make sure it’s connected to an electrical outlet and the batteries are fully charged. Also, the cord between the telephone base and jack should be plugged in and secure. If you have interference, try changing the channel.
If the issue went away
- Unplug connections and power supplies. This includes telephones, computers, faxes, modems, satellite television or cable boxes, alarm systems, adapters, and filters.
- Test your telephone line(s) by plugging a single phone directly into a telephone jack (wall).
If you still have the same issue
- Plug in the equipment you just unplugged, one device at a time.
- Check for the problem after each addition. If the issue reoccurs, remove the last device added. It’s likely the cause of the problem.
- Repeat until all of the equipment has been successfully added (you may have more than one piece of equipment causing interference).
- With a single phone: Test using another telephone. If the problem doesn’t occur with the second phone, your issue is likely with the first phone.
- With two phones: Test both phones, one at a time, on a different telephone jack. If the problem doesn’t occur with the second jack, your issue is likely with the first jack.