The phone tries to contact the boot server in order to download firmware and configuration files. Setting this option to Static may help in resolving this error.
To change the phone's Boot Server setting
- Using the phone's IP address and a computer on the same network as the phone, open a web browser and access the phone's web interface (GUI). (Refer to manufacurer's documentation for detailed guidance on accessing the phone's web GUI.)
- Click Settings > Provisioning Server > DHCP Menu.
- In the Boot Server field, select Static (default is Custom+Opt66).
- Click Save.
- Allow the phone several minutes to restart and attempt to obtain the proper configuration.
Note: On some devices, the default Boot Server setting on the device is Static. In this case, change the Boot Server setting to Custom+Opt66, click Save, and allow the device to restart.
If the above continues to result in the Line Unregistered error (or you find you are unable to complete these steps on your own), please contact 8x8 Technical Support for additional assistance.