I would not wonder if these calls are directed over The Peoples Republic of North Korea just to have the cheapest connetion

... or at least over Orascom ...
I just wonder how they do this hijacking, from my military time I do know it is possible to do those things but you have to be really close to the material and technical or at least know important infrastructural questions to hijack a call and to reroute it this way.
And the last question is how do they cash their income, if the reroute is spreaded over different countries with different involved companies then it's getting really interesting how they manage it.