>What will be the behaviour of BOIC (Barring of all international calls) in roaming.
Calls, which called partys are treated by visiting MSC as International (from point of view of visiting country), will be aborted.
>Is it possible for customer to make calls to local country number.
With exported BOIC to visiting country number?
Yes.
>And what is the difference between BAOC (barring of all outgoing calls) and BOIC
BAOC makes all outgoing calls aborted. Some MSC have internal parameters that aborts on that flag all outgoing SMS also.