Hi, I'm Nathan.Sorry to hear that you're having trouble, but I'll do my best to help you. Please give me a few moments to review your details here.
Can you tell me where you are seeing/hearing an indication that it is full, or is that something your callers are hearing?What is the model of your system (on the base station, rather than handset)?
If you pick up the line and listen carefully, what do you hear - a few beeps or a fast/stutter tone prior to the dial tone, perhaps?
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