OPNsense and Digibox (Telekom / bintec-elmeg)

[theo-tiger]

Hi there,
I am pretty much a newbie...but nevertheless I plan on setting up an OPNsense Machine as
Firewall / DHCP / openVPN-Gate

Small SoHo Network with appr. 7 Users
Current Setup:
DigiBox (SIP-Trunk Telekom VDSL) As Gateway and DHCP --- LAN-Switch-Network
and
DigiBox (SIP-Trunk Telekom VDSL)---ISDN / DECT Phone-Box

Planned Stup:
DigiBox (SIP-Trunk Telekom VDSL)---ISDN / DECT Phone-Box  (as before..would lke to leave this more or less untouched)
and
DigiBox (SIP-Trunk Telekom VDSL) --- OPNsense machine as Gateway and DHCP / Firewall and openVPN Gate --- LAN-Switch-Network

The OPNsense Machine has latest Version, sufficient Memory / Disk / CPU and 2 GigaBit NICs (could be enhanced to 3 NICs if needed

Maybe someone has a similar setup and some helpfull hints at hand.

Any help would be welcome...