Aastra 9480i User Manual page 183

IF
An incoming call comes in on the line in focus that has
a disconnected screen displaying,
An incoming call comes in on another line (NOT in
focus), and the disconnected screen is displaying on
the line in focus,
A phone application is NOT in focus,
Note:
This "indication of terminated calls" feature does not affect parked calls on the phone or the conference call feature.
The following procedure describes how to handle the disconnected screens on your phone.
IP Phone UI
Goodbye
1. Press the Goodbye
The busy tone stops and the disconnected screen no longer displays.
or
Select any Line key.
The busy tone stops and the disconnected screen no longer displays.
A dial screen displays.
41-001382-00 REV01 – 06.2013
THEN
the line in focus with no calls on hold:
displays a ringing screen
the line in focus WITH calls on hold:
flashes its' Line LED
the disconnected screen no longer displays on the line in focus.
busy tone plays
no disconnected screen displays
When the phone application in focus on screen stops:
busy tone plays
disconnected screen displays
key.
Available Features Enabled by Administrators
176