Door intercom system - Which components are there in GIRA and Siedle?

Hello,

I want an intercom system with audio function (further features possibly prepared but basically not desired).
Now I have tried to find out which components I need for this, from GIRA or Siedle.

The following I believe to know:

Siedle
Classic
- 1+n technology or 6+n technology (430€)
- what is the difference? 1 conductor vs. 6 conductors, but what does it bring? For video?

DoorCom
- Adapter for A/B port of the FritzBox
- 1+n (360€)
- no 6+n available? Instead take IP?

Power supply NG 602-01
- power supply (244€)

- What kind of flush-mounted boxes for door station?
- DoorCom and power supply can be housed indoors optionally surface-mounted or flush-mounted in a suitably large box (e.g. near the chime)

Installation
- Connect power supply to 230V
- Connect door station + DoorCom via power supply for power supply
- Connect door station via 2-wire to DoorCom
- Connect DoorCom via 2-wire to A/B port of FritzBox

GIRA
Door station audio
- stainless steel (494€)
- door station aluminum (368€)

Control device audio (111€)
- power supply

TKS-TK-Gateway (150€)
- connection to A/B port of FritzBox

- 2x any 60mm flush-mounted boxes for door station if not surface-mounted
- Control device and gateway can be housed indoors optionally surface-mounted or flush-mounted in a suitably large box (e.g. near the chime)

Installation
- Connect control device to 230V
- Connect door station + DoorCom via control device for power supply
- Connect door station via 2-wire to control device (or also directly to the gateway?)
- Connect control device via 2-wire to gateway
- Connect gateway via 2-wire to A/B port of FritzBox

Primarily my question refers to the components so that I don’t forget anything when ordering.

Regarding installation I have not yet become very clear from the previous information from the manufacturers, but I will try to research further myself tomorrow. This topic is therefore rather secondary here, although I would of course also appreciate hints.

Also checked components from Buschjäger and Ritto and found the following:

Busch-Jäger

- Busch-Welcome door station €120
- Busch-Welcome system center mini €118
- Connection to door station
- Busch-Welcome telephone gateway €180
- Connection to system center as well as to Fritzbox
- plus flush-mounted boxes, unclear which
- finally there is also a graphic at Busch Jäger, so I believe I have covered all components (see attachment)

Ritto

- Acero PUR stainless steel door station €352
- TK adapter a/b €301
- Power supply unit for TwinBus systems (€232)
- plus flush-mounted boxes, unclear which