My Beocom 2500 keeps having a blinking light.

According to the manual it does this when the line is in use.

But the line is not in use and when I unplug the phone it steel keeps blinking.

Anyone a solution?

I can't be absolutely certain, but I think it means the batteries need replacing.

It also does that when there are unanswered calls. The show number function will show you the number of those who have called you. The red light will then stop blinking when you cheked these numbers

It flashes fast and it says that the line is in use. But when I unplug the phone it still keeps flashing...