AT&T definity 7444 User Manual page 9

Conference Allows you to add a third party to a call, so that you can conduct a
3-way conversation. (If you want to conference more than 3 parties, call your
attendant for assistance.) Use to set up time-saving conferences or to spontaneously
include a third party.
Drop Disconnects from a call without requiring you to hang up the handset or press
the switchhook. Can also be used with the Conference feature to disconnect the last
party added. Use whenever you want to continue using the handset for another action
after ending a call.
Hold Puts a call in a holding state until you can return to it. While a call is on hold,
you can place another call, activate another feature, answer a waiting call, or leave
your telephone to do another task. Use when you have a call that you don't want to
drop, but have to interrupt briefly to do something else.
Intercom (Automatic/Dial) Gives you quick access to specified telephone. With
Automatic Intercom, you can call predetermined persons by pressing a single feature
button. With Dial Intercom, you can call any member of a predetermined group by
pressing a feature button and then dialing the group member's 2- or 3-digit code.
Last Number Dialed Automatically redials the last number you dialed, either an
extension or an outside number. Use to save time in redialing a busy or unanswered
number. Available with DEFINITY® Generic 2 and System 85 R2V4 and some R2V3
systems. Check with your System Manager to see if the feature is available in your
system.
Leave Word Calling (LWC) Leaves a message for another extension to call you back.
The called party will be able to dial the message center, AUDIX, or a covering user to
retrieve a short, standard message that gives your name and extension, the date and
time you called, and the number of times you called. Use any time you want to have
someone call you back; it will help cut down on repeated call attempts.
Message Your Message light lets you know that a caller has left a message for you.
You can then follow your System Manager's local message retrieval procedures to get
your message.
Mute Turns off the microphone of the built-in speakerphone or the handset. Use
when you want to confer with someone in the room with you, but you do not want
the other party on the call to hear your conversation.
Priority Calling Allows you to call another extension with a distinctive 3-burst ring
to indicate that your call requires immediate attention. Use when you have important
or timely information for someone.
Reset Speakerphone Initiates an acoustic test of the surrounding acoustic
environment by using a sequence of tones. When the tones stop, your speakerphone
has finished adjusting itself for optimal performance. It is now ready for use. Use
whenever you move your telephone to a different location (even in the same room), or
whenever the light next to  Speaker-Reset Spkr 
Select Button Used in any of 3 different ways:
 Drop-Test 
1 ) When used with
ringer, and display.
is fluttering.
you can perform a self-test of your telephone's lights,
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