AT&T 410 820 - Manual (Page 23)

Handset Interactions
To switch from the handset to the Hands-Free Unit during a call,
just touch Speakerphone On/Off and hang up. To switch from
the Hands-Free Unit to handset just lift the handset; the Hands-
Free Unit goes off automatically.
HEADSET ADAPTER
The Headset Adapter allows you to plug in a standard headset
for hands-free operation.
To place a call, touch On/Quiet and dial.
To answer, touch On/Quiet.
To disconnect, touch Off.
To mute the microphone, hold On/Quiet down.
GENERAL PURPOSE ADAPTER
With the General Purpose Adapter you can attach to your
MERLIN system voice terminal most types of telephone and
data devices, such as modems, facsimile machines, automatic
dialers, basic and cordless telephones, and transaction
telephones. In order for you to use this extra equipment, your
MERLIN system voice terminal and the added phones must
have Touch-Tone lines. When you use one of the telephone or
data devices to place a call, the General Purpose Adapter switch
should be in Basic position. If you want to join or record a call
in progress, slide the switch to the Join position.
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