Hello Martha and thanks for choosing the JustAnswer.com Phone Systems subcategory of the Electronics category.

Reset the controllers as follows:

• Remove the rechargeable batteries from each of the cordless handset(s).
• Unplug the main base power cord from the wall outlet. (Not to be confused with the remote charging base)
• Unplug the other end of the power cord from the main base.
• (If the main base also has a main backup battery, remove the battery.)
• ----- Wait 20 minutes. -----
• (The timing is very important --- 15 minutes is too short and 30 minutes may be too long. If you miss the time window, plug the unit back in for 5 minutes and start over.
• Re-connect the power cord to the main base.
• Re-install the rechargeable battery in one of the cordless handsets.
• Place the cordless handset in the main base.
• Re-connect the main base power cord to the wall outlet.

-----

• If no change try a different phone jack and/or phone cord.

• Request a remote line test from the local phone company.
• If inconclusive, have them check their lightning arrestor at the side of your building.
• The lightning suppressor at the side of the building may be defective.
• This is the property of the phone company and must be replaced by them.
• The lightning suppressor normally only activates at high voltages.