Most intercoms are analog single-dialers and do not work with multi-dialers. It is for them to work together invented pairing blocks. All we need to know is that they are marked:
VZ and are designed to work with coordinate intercoms
XL - designed to work with digital intercoms.
On the one hand if you already have an IP intercom, you probably do not need this note.
But if you want to put an IP- intercom in your apartment, you must remember to connect it to the entrance is extremely difficult and expensive. The price of the interface box will be on par with the price of the intercom. So you have to make do with a simple call in the apartment from the landing. Fortunately there are different types of intercoms and one of the most popular doorking is the one that allows you to receive calls directly on the phone.
Choose a bell / call box.
Here already anyone who likes what you like, there are many technical nuances, most importantly that it suited the chosen intercom.
After choosing the door phone and call panel for the house, you need to choose a lock that will stand on the gate.
The tenants can also choose a lock, but in most cases they do not need one, because they only open the entrance door remotely.
