so I’m really not making much progress. I actually don’t want an IP solution. That’s why I would almost exclude the doorbird. My electrician would have gone for an elcom home.audio (500eur) or even home.video (1500eur) set. it includes an outdoor station with/without camera, a transformer, a relay, and an indoor station. I don’t need an indoor station because connecting it to the Fritzbox still seems to me to be the right approach. especially when it comes to expansions. the system is 2-wire. so in my opinion ideal. it also looks rather stylish. especially in anthracite. although I like the doorbird better! the outdoor station is also available separately. audio 250 video 600. I could probably connect that directly to the Fritzbox. but then I could only connect the door opener directly to the outdoor station, which I don’t want. for that there is still the relay. I think that allows the connection and costs 200. I can easily add video later via IP through the Fritzbox. if the relay is not enough, there is also an accessgate relay. but that costs 600. it then allows the connection of IP camera and co to it. but I actually don’t need that. I hope I can do without it. in the best case I have everything I need with RER113Y outdoor station audio 1/1 access point 2-wire anthracite/gray matte (250eur) RED011Y bus line power supply with relay REG (200eur) outside I will then eventually connect a cheap IP camera and then the thing could be complete. maybe I need the TJA510 - Access Gate 2D/IP interface REG (600eur) instead of the relay - that would significantly increase the costs. but it probably wouldn’t bring me anything that can’t be handled by the Fritzbox.