VTech I6778 - Manual (Page 11)

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If you subscribe to DSL service
If there is interference during telephone conversations and/or your caller ID features are not functioning
properly, install a DSL filter to the telephone line between the telephone base and the telephone wall
jack. To obtain a DSL filter and more information about DSL interference, contact your DSL service
provider.
Installation
• Most DSL
providers
recommend
installing a DSL
filter in every
telephone jack.
Your DSL service
provider may
provide more
information
regarding
telephone
interference.
DSL filter (for
DSL users)
To single telephone jack (RJ11C) Telephone line cord