Answer: intercom

AnswerCrossword Clue
INTERCOM

Office hookup

INTERCOM

Paging device

INTERCOM

Part of a PA system

INTERCOM
School sound system
INTERCOM
Office squawker
INTERCOMSyst. for sharing ideas
INTERCOMHouse phone
INTERCOMTwo-way sound hookup
INTERCOMSet on a jet
INTERCOMSquawk box
INTERCOMOffice stepsaver.
INTERCOMOffice chatter-box.
INTERCOMSchool communication device
INTERCOMOffice machine
INTERCOMHousehold appliance
INTERCOMOffice speaker system
INTERCOMSquawk-box system
INTERCOMOffice communication device