Thanks a lot for your prompt reply and thanks for sharing the guide!
I had followed that specific guide already, I found it on this forum.
However, not all labels are the same in the newer RutOS.
Hence, I had made several presumptions, maybe errornously.
I coul dn ot get the VPN working as per the instructions (dial up construction),
so I changed it to a normal VPN, the SIM card we're using is equipped with a
fixed IP address, which makes this possible.
I hereby attach the screenshots you were asking for, I hope these are the
configuration pages you were looking for.
With kind regards,