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Hello & Welcome to Just Answer,
Sorry to hear of the issue you are having with your phones.
To help you with this issue, may I ask:1) The Model Number of the MAIN BASE UNIT of the phone system you are working with? I only ask because the CS 6409 model I see is an "accessory" handset for a few different systems.2) How many TOTAL handsets do you have with the MAIN system?3) Where these handsets bought as "add on" handsets?