Hi there:
Only for information (mainly for spanish hams)
Now, finally, my system is working fine.
At Control Side: ADSL 10MB Yacom
At Remote Side: Modem 3g ZTE + Router TP-Link with pre-paid SIM card (eroski movil). Doesn't work with Orange or other virtual operators like Simyo or Masmovil, because they only give you a private IP, not accesible from outside your LAN.
73's de EA5WA Juan Carlos