Hi again and thanks for the answer,
"Please try to use PPP mode in Network -> Mobile -> General -> Connection type: PPP"
I have the same problem :(
"When you was testing RUT905 and RUT955, does they used the same Firmware version?"
Are diferents (and older) versions:
RUT 955 with problems
FW ver.: RUT9XX_R_00.05.02.5
RUT 230 working fine
FW ver.: RUT2XX_R_00.00.284
RUT 905 working fine
FW ver.: RUT9XX_R_00.03.923
Thanks again for your time.