Currently my company is running the VoIP thru ISDN to sub-company in different region. The configuration for current setup is whenever there's a IDD call to overseas on my site, that call will be routed to local ISP and the sub-company will routed to their local ISP. Due to the high-cost of the IDD service provided by sub-company local provider, the management decided to routed the IDD overseas call go thru my sites ISP instead of their local ISP.
I would like to have an advice from the expert, could it be done in real life because what i know that some country they deny this kind of setup because the IDD services is one of the goverment making money services.
If it could be done, what's the procedure to do that?