asterisk users - May 2012 - special digits * # on sip dial string

hi guys.
sorry if this is a silly question.

My recharge application uses * digits if the subscriber wants to send
some aditional information to speed up a process, dialing something
like *777*123*5000
On my old ss7 network works great, but on my new ngn/sip i think it's
not possible because somewhere the call is rejected.
  	-On the NGN/Ericsson side engineer say that the call whas deliverd.
	-On the asterisk side there is no invite shown on debug.


Can sip one or more * signs in a dial?
What am i doing wrong.

thanks in advance..
rv