olemus
kakspunkt-siseside süsteem, ukse kaugavamise funktsiooniga

Wiktionary:
an intercom system which enables someone, without opening the door, to converse with the person who has rung the doorbell

piltlikult
https://duckduckgo.com/?q=doorphone&t=h_&iax=images&ia=images

ülevaateid
https://en.wikipedia.org/wiki/Video_door-phone

näiteid
https://uk.bestreviews.guide/door-phones

https://www.bestreviews.guide/color-video-door-phone

turvalisus
https://www.synacktiv.com/ressources/HackLu2016-Intercoms_Hacking_presentation.pdf

https://www.penthertz.com/resources/Synacktiv_intercom_hacks.pdf