I own a three flat building and I would like to upgrade the old intercom system. It’s just a basic doorbell / voice intercom with electric lock control.

I see a lot of affordable systems on Ali Express but I am not sure if they are worthwhile or reliable in the long run. I am not looking for a smart system, just a newer system with video and electric door capabilities. If it could use the existing wiring that’s a plus but not necessary. This would be a DIY project, I am an experienced technician with plenty of installations under my belt.

I have browsed this and the home automation forums but nothing really jumped out as a solution. If not the systems available on Ali, what suggestions do you have?

Thanks