Silverton compatible?

Hello, I am new both in this forum and with Nuki Smart Lock as I got mine a week ago and I am very happy with it.

Now I am interested on getting my building’s intercom smart too, but I don’t see it in compatibility list, as it is from a company that seems active only in my country. On their page they say that they use KNX protocol. Not sure what is it or if my 2006 installed device uses it.

I took some photos and I hope someone here to enlighten me before I buy a Nuki Opener just to realize that I won’t be able to use it (I am interested on the ring-to-open function mostly).

Thank you in advance.