Why is "line in use" message keep flashing when there's no-one using

I have checked both phones, unplugged them, checked the batteries and still the base

phone has the flashing light and I cannot make a call out.

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What happens if you try to call the phone from another phone such as a mobile phone?

Do you get a busy signal or a ringtone signal?

If a ringtone signal does the phone ring?

If not or if you get a bust signal when you call the phone number contact your phone service provider and get them to test the line as you may have a line fault.