Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, bear with us; re-confirm and post back with the complete model number of the phone system.
Additionally, who is your phone service provider please?
Appreciate the additionalinformation.
Please confirm; are you using Cox's VoiceMail service or the Panasonic's built-in answering machine?
Let's try a test; press star ( * ) and the numbers 2- 9- 8
call your 10-digit home phone number
check if there are any messages.
If yes, listen and delete (all) when heard.