VTech IS7121_-2-22 Manual - Manual (Page 55)

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Join a call in progress
You can use four cordless handsets at a time on an outside call. You can buy
additional expansion handsets ( IS7101) for this telephone base. You can register up to
10 handsets to the telephone base, including a maximum of two doorbells.
To join a call::
When a handset is already on a call, press or on another handset to join
the call.
To exit the call, press
OFF on the handset or place it back in the telephone base or
charger. The call continues until all the handsets hang up.
When two handsets are in use for a call, only audio streaming can be performed with
the doorbell using other handset(s). To allow video streaming to take place, end the
call on either handset or both handsets.
When three or more handsets are in use for a call at a time, video streaming will
be disabled.
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Multiple handset use