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Identify devices that require a filter

Check if you need to install or replace a phone line DSL filter with the Verizon Troubleshooter.

Filters block the DSL signal from reaching your telephone, fax, or answering machine. Except for your DSL modem or wireless router, every telephone machine sharing the phone line that has Verizon Business Internet requires a filter. If filters are missing, you may experience reduced speeds as well as static or hissing on the telephone line.

Note: Using more than five filters can reduce the quality of your Verizon Business Internet service.

Where do I install filters?

Figure depicting not installing a filter standard telephone
Install filters on common phone devices
Figure depicting not installing a filter on your modem
Don't install filters on DSL modems or wireless routers

Other common devices that need filters:
  • Regular phones
  • Cordless phones
  • Caller ID units
  • Answering machines
  • Fax machines
  • Dial-up modems used for DSL backup or point of sale equipment
  • Satellite TV dialers
  • Meter readers. Check with your gas and electric company.
  • Monitored security systems that use the DSL phone line (check with your security company to determine if this is necessary)

Using the filter

If you need additional filters:
  • You can purchase them online at the Accessories Store
  • Visit your local computer store.
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