An aspect of intercom use is how/where calls are received. Especially with older 2-wire and facilities with a manned security guard station, it is common that all intercom calls get routed to a central 'master station' or phone set first for answering.
Modern VoIP/SIP systems often blur the lines here, but generally, modern 'IP' intercoms call a mobile app (via the cloud), so someone who answers may not even be in the building where the intercom button is pressed.
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