I am in a big problem. I have created a VOIP billing system, in this system, I used to bill a call destination using international prefix code eg : 001 for US and 0091 for India and all.
But the people who are using this system used to add different rates for 0091 and 91, so in some cases the rate calculation is wrong.
I am selecting the rate using the prefix.
So can anyone please help me ?