AT&T 7406BIS - Manual (Page 58)

Display Features
On/Off
The display is on when the voice terminal is on and off when the voice terminal is off.
Normal Mode
In the normal mode, the display shows call information for the current active call
appearance:
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You may have as many as 10 call appearances. Beginning with the first button in
the upper left corner of your faceplate and going down, the display identifies the
first 5 buttons as a through e; the 5 buttons in the second column are identified as f
through j. When the display shows [ a = ], it represents call information for the
first call appearance. The next button down would be shown as [ b = ], and so on,
continuing through [ j = ] if all 10 of these buttons are used for call appearances.
When you dial an extension, that number is shown and then replaced by the called
party’s name and extension.
When a call is received from another extension, the caller’s name is shown (or the
caller’s extension if a name is not administered); when a call is received from
outside, [ OUTSIDE CALL ] or a trunk identifier is shown.
The display remains in normal mode until you activate one of the other display
features. After using any of these features, return to normal mode by pressing
[ Normal ].