Hi Joyce,
This type of problem requires you to check if the base or the phone line has a problem.
I prefer to use an old corded phone for testing and a new cable Unplug your phone base from the jack and check for dial tone when you plug in your test phone.
If you get a dial tone on the test phone, try the new cable with your cordless phone. If you still get that message, then the phone has failed. If it is under warranty, contact the manufacturer for repairs. If it is out of warranty, then determine if it is worth fixing or replacing.
If you do not have a dial tone, take your test phone to another jack on the phone line. Check if there is a dial tone at that point. If there is a dial tone, the problem is at the first jack or the phone line to the jack.
If you still do not have a dial tone at the second jack, call the phone company and have them test the line and repair.
Thanks,
Byron