freemate DA-275, Owner'S Manual

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4. Operation
Receiving by headset : Depress the headset/handset
button(feature no.3), wear the headset. Lift the handset from its
cradle and place it "off hook" when the telephone rings. You can
answer the telephone by headset.
Making a call by headset : Depress the headset /handset button
(feature no.3), wear the headset.
Lift the handset from its cradle and place it "off hook" and dial after
listening tone signal. To terminate a call, hang up the telephone
handset.
Handset use : Press the headset /handset button (feature no.3), lift
the handset, dial after listening dial tone.
* Off hook lever use( option) : "Off-hook Lever" eliminates the need
for you to lift the handset, just pull the lever when the telephone
rings, you can talk with the caller without completely removing the
handset from its cradle.
Remarks : if your telephone has a program for "headset" use or a
switch that can be used by headset, you won't need to lift the
handset every receiving or call. Just press a button for making or
receiving a call. The telephone that has the headset-use button will
vary from one telephone to another, but most often it is the "line
button".
Check your telephone's manual for details. Most of key phone
systems have this program.