With many Uniden cordless systems the letter "A" indicates that the machine is in announce mode, which plays an outgoing message but does not record any incoming messages. If you want the machine to record incoming messages then you need to switch to the answer mode.
Since you didn't specify the model of your Uniden cordless system I can't tell you how to switch modes. I can suggest you select the model of your system from the list beginning here to download a copy of the manual.
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