Aastra 57i IP Phone User Manual page 37

Depending on how the phone has been configured, the maximum number
of total line/call appearances that can be set up is 8 or 9 (4 line/call
appearance as hard keys and 4 or 5 as softkeys). If all line/call appearances
have been set up for the same number, a total of 9 lines can be configured.
If all line/call appearances have been set up between two different
numbers, a total of 8 lines can be configured. This means that when all line/
call appearances are in use, 1 call is connected while the rest are on hold.
No further outgoing or incoming calls can be made until one of the line/call
appearances becomes available.
In active states, such as ringing, conference, connected, etc., all softkeys
disappear except softkeys that have been set up as line/call appearances,
and any context dependent softkeys required for the active state, such as
the Drop softkey in the connected state. Typically, context dependent
softkeys appear in the top left position and all line/call appearance softkeys
appear in the remaining positions.
Note: In some situations, such as during a conference call, the line/call appearance
softkeys may overwrite some of the context dependent soft keys. In this case,
instead of the Previous and Next softkeys, up or down icons,
on the display. By using the
same functionality as the Previous and Next softkeys.
navigation keys, you can access the
Model 57i IP Phone User Guide
appear
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