Automation and AIPHONE intercom

Hi

I recently bought a flat and have an APIHONE (GH-1KD) intercom. The problem is it’s downstairs and I work upstairs. When someone rings, I can’t open the door if I don’t reply quickly enough.
I am looking for a way to open the main building door from upstairs (or my phone), so I thought I could use Home Assistant. Do you have any idea how I could do it?

Alternatively, I could change the intercom, but I don’t know which one to pick.

Thanks for your help