Hello & Welcome to Just Answer,
Sorry to hear of the issue you are having with your phones.
To help you with this issue, may I ask:1) The Make & Model Number of the phone system you are working with? It sounds like a Panasonic system, so that model should be printed on the bottom or back of the MAIN BASE and START with KX-TG.2) How LONG have you had this system connected at this location, and WHEN did this issue first begin?3) Did the phone service provider (phone company) give you any instructions on how to access THEIR voicemail system?
I see it has been a few days and I just wanted to follow up to see if you have any more questions concerning this issue or if the issue was resolved.
I look forward to any further questions or results that you may have.
Thanks, ***** *****--. .-(im)