The most optimal option for installing an individual video intercom in an apartment is actually the presence of free space on the landing, which is also fenced off by an additional metal door. In this case, the most important call unit is installed behind another door. Such a door is equipped with an electromagnetic and remote-controlled latch or simply a magnetic lock.
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During the installation of such a lock, it is desirable to have a closer for the door. Depending on the landing, inside such a fenced-off space, either an additional outdoor unit is installed, or just a miniature video camera that provides an overview inside such a space.
If there is an agreement on the floor between the neighbors, then it will be much more convenient to install a low-subscriber and special block for this, which has a separate call button for each apartment. In such a system, unlike a multi-subscriber system, a standard monitor is used, only for an individual video intercom. All this allows the use of previously installed equipment.