Ericsson DT59C - Manual (Page 16)

Description
DT590 16
Diverted call:
If the dialed number is diverted, the diversion information is shown.
For example, the display shows the dialed number 3333 (Smith)
diverted to 4444 (Brown):
When the diverted call is answered, only the number of the
answering position is displayed:
Incoming call
Normal incoming call:
If available, the number or the name of the caller is displayed.
00:11
4444
>3333
00:18
4444
00:05
3333