I didn't see a response back from my original question (what brand of system), but I wanted to send the following information anyway.
If you can send me the brand, I may be able to give you more details.
For MOST systems like this, when you see an "A" on the display, it means that the answering system is set to some kind of "Announce Only" mode. What that means is that the system will ONLY play a prerecorded announcement - either one you recorded OR a "default" announcement that tells the callers that you are not available to answer the call and to try again later.
If this is the case, the "fix" is to go into the Answering system "setup" controls and change the mode so that the "Announce Only" is turned OFF.
Again, if you can send me the FULL MAKE & model of the system, I may be able to give you more details. Please let me know if you have any more questions.
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Thanks, ***** *****