Aastra 57i CT IP Phone User Manual page 14

Note: New updates to your phone can be automatically scheduled from the server.
This is set up on the phone system by your system administrator and should
be scheduled during non-business hours or slow call periods.
Important! Do not unplug or remove power to the phone while it is checking or
installing firmware and configuration information.
If language packs were loaded to your phone by your system administrator, the
following screen displays during startup.
When the configuration update is complete, the phone displays the following
screens and then displays the Idle screen..
6 Model 57i CT IP Phone User Guide
Checking for firmware...
Do not unplug the phone!
Downloading
Language Packs
Network