There is a problem with the connection from your computer’s modem to the phone jack.
Check the modem connection
If you are using a desktop computer with an internal modem, make sure the telephone cable is plugged into the back of the computer in the port called “line.”
Check the phone jack service
Make sure that the phone jack in your wall is working properly. Plug a telephone into the same phone jack and lift the handset to see if you hear the dial tone. If you do not hear the dial tone, the phone jack is not working properly and you should contact your phone company for repair.
Check the telephone cable
Verify that your telephone cable is working by trying it with your telephone or replacing it with a cable that you know works.
If you are still not able to connect, contact Customer Support.