WHY IS CL ( OR C ) FLASHING IN THE BASE MESSAGE WINDOW?
This indicates that you need to set the time and day on your answering system. During initial setup and any time there is a loss of power to the base, you will see this flashing indicator. Consult your User's Manual for instructions on setting the day and time. Manuals for most models can found on this site. Click on the PRODUCT SUPPORT > MANUALS link, then search for your particular model.