AT&T 7406BIS User Manual page 13

Lets you answer a call at your voice terminal for another extension in
Call Pickup
your pickup group. Use when you want to handle a call for a group member who is
absent or otherwise unable to answer. Note: You can use this feature only if you and
the called party have been assigned to the same pickup group by your System
Manager.
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 important to a discussion.
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 voice terminal 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)
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.
Gives you quick access to specified voice terminals. With