(Smart) door intercom system planning on Fritzbox in new construction

[*]During the electrical rough installation, I laid a Cat7 LAN cable to the door – but it can also be replaced/supplemented with any bus cable.
[*]I exclude WLAN. I am now considering whether bus, LAN, or DECT. It should be connected to a FritzBox 7590.
[*]An electric door opener is available – it should be connected "securely" (in the basement?).
[*]A camera is desirable but it points directly to a public area and is next to the door. So it must either be installed with an angle bracket or have a large detection area.
[*]I don’t need monitors. There will be a Fritzphone on every floor anyway. They are to be used for answering. Video can also be transmitted there.
[*]I need/want the option to answer the door call via mobile from outside and open the door (for possible package deliveries). Preferably then with video transmission, so via app. Maybe a keypad at the bell would also be possible. I want to be able to change the code at any time.
[*]The door intercom system should be expandable with IP cameras (this would be especially important if no camera is installed).

[*]It is recommended to additionally install the DoorBird IP E/A Door Controller A1081 so that the lock/latch cannot be easily operated by short-circuiting the contacts from outside.
[*]Doorbird products require online registration. Functions like receiving push notifications on the smartphone or operating the intercom remotely via smartphone run through a cloud service in Germany. Also resetting to factory settings or regular firmware updates.
Important though: if you do not want to use the cloud service, the Doorbird can be used locally like a regular intercom.
[*]The technology used for RFID is not cryptographically secured, meaning the chip can be copied. For me, this is an acceptable risk.
[*]The camera offers "only" 720p, so not Full HD. For me, this is sufficient.
[*]The voice quality is said not to be outstanding.
[*]Doorbird does not yet offer a HomeKit-certified product. It might be that something will come next year.

[*]630 Euros for DoorBird IP Video Door Station D2101V
[*]260 Euros for DoorBird IP E/A Door Controller A1081
[*]450 Euros for DoorBird IP Video Indoor Station A1101

I want to have a Doorbird D2101V installed for this application at our place. It can be powered via POE from the LAN cable. This way, I can operate the intercom and the door lock remotely using the supplied Doorbird app.

Furthermore, it can be connected to Fritzfons via SIP and also offers a REST interface, which can be used, for example, to forward the video stream to a NAS or similar.

I find the product very interesting because it includes an RFID reader. This allows me to give our son an RFID chip instead of a key. If he ever loses it, I can deactivate the chip and use a new one.

There is also the option to purchase the Doorbird with a numpad or to have an ekey fingerprint sensor installed.

What is important to note is the following:

[*]One should additionally install the DoorBird IP I/O Door Controller A1081 so that the lock/latch cannot simply be operated from the outside by short-circuiting the contacts.
[*]Doorbird products require online registration of the product. Features such as receiving push notifications on the smartphone or operating the intercom remotely via smartphone run through a cloud service in Germany. Also included are resetting to factory settings or regular firmware updates. Important though: if you do not want to use the cloud service, the Doorbird can be used locally like an ordinary intercom.
[*]The technology used for RFID is not cryptographically secured, meaning the chip can be copied. However, this is an acceptable risk for me.
[*]The camera offers "only" 720p, so no Full HD. For me, that is sufficient.
[*]The voice quality is said not to be outstanding.
[*]Doorbird does not yet offer a Homekit-certified product. It could be that something will come out next year.

I will also get an indoor station so that guests (e.g., relatives) in our house can also see who is ringing at the door from inside.

All in all, the costs are approximately 1340 euros:

[*]630 euros DoorBird IP Video Door Station D2101V
[*]260 euros for DoorBird IP I/O Door Controller A1081
[*]450 euros DoorBird IP Video Indoor Station A1101