VTech DS6670-6C Manual - Manual (Page 46)

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Join a call in progress
You can use four system handsets on an outside call at a time. You can buy
additional expansion handsets ( DS6071) and an additional cordless headset
( IS6100) for the telephone base. You can register up to 12 devices to the telephone
base, including a maximum of two cordless headsets. The telephone base
recognizes and counts a headset the same as a handset.
To join a call::
When a handset is already on a call, you can join the call by pressing /HOME,
CELL 1, CELL 2 or on another handset, or on the headset.
To exit the call, press OFF or place the handset in the telephone base or charger,
or press on the headset or place the headset in the telephone base. The call
will not end until all handsets and headsets hang up.
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Multiple handset use