Restart a Cisco phone
Reboot from the phone or a browser.

Restarting fixes many small problems.
Steps
- On the phone, press Applications and go to Device administration → Restart.
- Or, in a browser, open the phone's web page and use the reboot option.
Reboot from the phone or a browser.

Restarting fixes many small problems.
Register a 6821, 6841, 6851, 6861 and 6871 phone to your phone system.
Register a 7811, 7821, 7841 and 7861 phone to your phone system.
Register a 8811, 8841, 8845, 8851, 8861 and 8865 phone to your phone system.
Set up a third-party SIP line on multiplatform firmware.
Wipe a multiplatform phone back to defaults.
Lock down the phone's web page.