Sony HIPATH 8000 - Manual (Page 81)

Making and receiving calls using multi-line phones
81
Step by Step
Dial last dialed number
The last number dialed on your telephone (regardless of
the line used for the call) is displayed for redialing via the
context menu of the selected number.
^
or
n
or
o
Lift the handset or press the speakerphone mode or
headset key.
S
Press the required line key. (Æ page 80).
In the pop-up menu:
Confirm. The connection is set up. Redial {1} 12345