Hi,
We have ruth240 with new firmware RUT2_R_00.07.02.4
with static Telekom ip apn: festip.telecomm its working, but you have only ipv6 access.
you can see your ipv6 with ssh ifconfig, try to ping it, or open ssh. try the ipv6 of lan, its allways thame.
if you want ipv4 you need in interface with 464xlat, unfavorably the kernel modul kmod-nat46 is missing, so opkg update, opkg install 464xlat has an error, may be Teltonica can provide this kernel modul.