Aastra 9143i Series Administrator's Manual page 751

Aastra Web UI
Step Action
7 Click on Operation->Reset.
8 In the "Restart Phone" field click
The update performs automatically at the time you designated.
41-001160-03 Rev 00, Release 2.5
to restart the IP phone and apply the update.
Upgrading the Firmware
Upgrading the Firmware
8-11