| Troubleshooting | 91Resetting Your PhoneYou can reset the phone to factory default settings.Procedure1. Navigate to Menu > Setting > Advanced > Reset Config.2. Tap Reset to Factory.The phone screen prompts if you want to reset to factory setting.3. Select OK.TroubleshootingIf you are having issues with your phone, you can try the troubleshooting options and solutions in the following topicsto resolve certain issues.• Why is the screen blank?• Why does the phone display “Network unavailable”?• Why does the phone display time and date incorrectly?• How can I obtain the MAC address of a phone when the phone is not powered on?• Why can’t I sign into the Skype for Business server on the phone?• Why can't the phone pair with my Skype for Business client?• Why can't I see the Calendar menu on the phone?• Why can't I get a dial tone?• Why doesn't the phone ring?• Why can't I receive calls?• Why doesn't my handset work?Why is the screen blank?• Ensure that the phone is properly plugged into a functional AC outlet.• Ensure that the phone is plugged into a socket controlled by a switch that is on.• If the phone is plugged into a power strip, try to plug it directly into a wall outlet instead.• If the phone is powered from PoE, ensure you use a PoE-compliant switch or hub.Why does the phone display “Network unavailable”?• Ensure that the Ethernet cable is plugged into the Internet port on the phone and the Ethernet cable is not loose.• Ensure that the switch or hub in your network is operational.• Contact your system administrator for more information.Why does the phone display time and date incorrectly?Check whether your phone obtains the time and date from the SNTP serverautomatically. If the phone fails to connectthe SNTP server, contact your system administratorfor more information. You can also configure time and datemanually.
