VTech 5873 - Manual (Page 12)

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Nose flter (for
DSL users)
To sngle telephone jack (RJ11C)
Telephone lne cord
If you subscribe to DSL service
If there s nterference durng telephone conversatons and/or your caller ID features are not functonng
properly, install a noise filter to the telephone line between the base unit and the telephone wall jack.
Contact your DSL provider for a noise filter.
Installation