My phone shows an X next to my first line key, What does this mean?

An X next to your line appearance indicates that your phone is no longer registered to your cloudUC service. If all other phones in your office are working properly, the first step is to try to reset your phone. Please power cycle your phone to see if this clears the trouble. If a reset of the phone does not resolve the issue or if all phones are exhibiting this issue, check to ensure that your Internet connection is operational. If it is not, please contact your IT vendor or your ISP. If your Internet connection is working, please contact NCTC support for further assistance.