Do all the residential buildings in the community have access control intercom systems now?

Now there is a building intercom system in general residential areas, which is convenient for unified property management and will send induction cards to owners.

Some also have video intercom. Visitors can conveniently call and talk to the residents through the host computer in front of the downstairs unit. Residents control the opening and closing of the door of the unit indoors. The host computer in the community can receive the alarm signal of residents at any time and send it to the host computer on duty to inform the community security personnel. The system not only strengthens the safety precautions of high-rise residential buildings, but also greatly facilitates residents and reduces many unnecessary troubles of going upstairs and downstairs.