VPN to Bintec router/ digitalisierungsbox

I have the following problem.
Need to connect to a bintec Be.ip Router (alias) Digitalisierungsbox via VPN. In this forum you connected a Mango Router to a Fritzbox wird vpnc.
I think this is similar to bintec Router but I’m not able to Setup connection. Has anybody tried it?

What is the vpn protocol? OpenVPN?

No, it’s IPsec (free configurable v1/v2/xAuth)

Sorry I do not have too much experience in IPSec.