Hi Gustavo,

>> ofonod[20340]: plugins/udevng.c:remove_device()
>> /sys/devices/virtual/tty/rfcomm0
>> ofonod[20340]: plugins/udev.c:remove_modem() /devices/virtual/tty/rfcomm0

Actually this looks highly suspicious to me.  What would still be using 
RFCOMM tty emulation?

> Does this work when you try to connect from a different DUN Client, like
> dundee, or even trying to open the RFCOMM channel by hand using the rfcomm
> tool?

An sdptool dump before starting oFono would be useful as well.

Regards,
-Denis