VTech CS6719-2 Manual - Manual (Page 30)

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Join a call in progress
You can use up to two handsets at the same time on an outside call.
You can buy additional expansion handsets (
CS6709) for this telephone base. You
can register up to five handsets to the telephone base.
To share an outside call:
When a handset is already on a call and you would like to join the call, press
or on the other handset.
To exit the call, press OFF or place the handset in the telephone base or charger.
The call continues until both handsets hang up.
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Multiple handset use