Using this option the application:
Place a GSM call (the application goes in background and the phone application in foreground)
Wait the call is declined by Abilis
Wait the recall performed by the Abilis, the user will be conencted to operator
Pass the desired number as DTMF
In Abilis, create a DISA callback newservice as in case of Callback by Data-Network , but a DIFFERENT service, in which the AUTO-CDO specifies the operator number.