Hello & Welcome to Just Answer,
I'm Greg and will do my best to assist you today.
Sorry to hear of any issue you are having with your phones.
To help you with this issue, may I ask:
1) How many TOTAL cordless handsets do you have with this system, and if more than one, do ALL handset have this same message on the screen?
2) The FULL Model Number of the phone system you are working with? Since this is a cordless system, that model should be printed on a sticker on the bottom or back of the MAIN base.
3) Do you have ANY other phones (NOT part of the Panasonic system) attached to this same phone line and if so, are they working properly (have dial tone)?
Please REPLY using the box below and the SEND button.
NOTE: If you see ANY requests for "additional services" - such as a phone call - please understand that these are sent BY THE SITE AUTOMATICALLY (and not me), and I may NOT be available by phone at the moment of that request. Feel free to DECLINE (close) any such offers, and continue in this text/chat form.