Display panel contrast, Calls with caller id, when available, Number of messages in your mail box – 3Com NBX 900-0208 User Manual
Page 24: Your extension number, Date and time, Status of persistent features with icons, Locked / unlocked, Fwd to mail, Handset / headset / speaker

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HAPTER
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OM
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ELEPHONE
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Left buttons — control calls that display beside them. Up to three 
calls display at one time and correspond to the three left buttons. 
Press a left button to answer an incoming call, rejoin a call on hold, 
and select it for other action. If no call corresponds to the button, 
press it to start a new call.
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Right buttons — bring up the action list for the corresponding call. 
From the action list, you can send a call to voice mail, add it to the 
phone book, park it, hold, transfer, conference, or release the call.
If the display shows a list, the right buttons also activate the 
corresponding option.
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Scroll buttons — up and down buttons move items up and down in 
the display, if there are more than three calls or list items to be 
displayed. Arrows in the display show if there are more calls or items 
above or below those displayed. 
The left and right buttons move you to the top or bottom of a list or 
move the cursor left or right when you enter data.
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Select button — at the center of the scroll buttons activates the 
currently highlighted list item.
The display panel shows:
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Calls with caller ID, when available
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Number of messages in your mail box
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Your extension number
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Date and time
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Status of persistent features with icons:
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Locked / Unlocked
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Fwd to mail
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Handset / Headset / Speaker
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Telephone lines in use with symbols in the column on the right
Display Panel
Contrast
You can adjust the display panel contrast as one of the User 
Configuration Features.
