SMS Handling

Dear All ...

I Plan to use CellIAX as least-cost route of outgoing call
Since the lowest cost is offered by a Pre-Paid GSM ... I need to always check available credit in it.
In normal condition (Normal Cellular usage) , All I need to do is to dial some special number (i.e : *999#) ... and wait the response come/displayed in a FLASH-SMS
so .. here is my question :

1. Can I set/config celliax always dial that number each time Call-out has been done/finished ?
2. How CellIAX handle FLASH-SMS ?

I need to do some other action based on the content of that Flash-SMS.

Sincerely
-bino-