V-Tech VT24 Manual - Manual (Page 9)

6. Intercom Function
Intercom function can be initiated by any Monitor when multi monitors are installed.
Intercom: Select Intercom item on main menu on any monitor to enter intercom
page, see the diagram on right.select one of user,then press Menu button to call.If
the selected monitor answers the call,intercom talking is strating.("!"means the current
operating monitor)
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Inner Call: Select Inner Call item on main menu on any monitor to enter intercom
page, see the diagram on right.All monitors will ring at the same time,whichever
monitor answers the call, conversation is starting.and the other monitors will stop
ringing .
User 1 calling user 2
2 1