AT&T System 25 - Manual (Page 31)

Incoming Calls (Continued)
When you dial the inside extension, Screen 1 displays it.
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Screen 2 remains the same.
OUTSIDE &
After the person you are calling answers, press
SOURCE
and
information about the person calling returns to the screen.
OUTSIDE &
If you press
DEST,
information about the person you are
calling now appears on the screen.
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If you press
JOIN,
Screen 1 shows a conference connection.
CONFERENCE 3
Pressing
RELEASE
(or hanging up if you have Automatic
Release) causes Screen 1 to go blank except for the number of
calls in queue.
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