The headsets keep popping up with the message "line in use" when they are not. I also unplugged the other phones etc... still show "Line in Use"? vtech model cs6229-3
These phones look at the voltage on the line to determine if the line is in use.
Do you have any devices on the line that get power from the phone line? If so, they may be loading down the phone line causing this issue. If you have these types of devices on your line, try disconnecting those devices and see if the problem goes away.
Otherwise, your phone line may be defective. You may need to contact your phone company to get the problem resolved.
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