Door intercom systems or door phone is a stand-alone voice communication system used within a building or small collection of buildings, functioning independently of a public telephone network. These systems normally consist of a camera mounted outside the door. Video intercom equipment is commonly installed as audio-visual communication systems at the entry-exit points of offices, so... https://www.globenewswire.com/news-release/2021/07/27/2269790/0/en/Door-Intercom-Market-to-Touch-USD-3-663-6-Million-by-2025-at-a-7-92-CAGR-Report-by-Market-Research-Future-MRFR.html