When the 087 number is used as the companies number it causes TNG to crash wile building the exchange file.
This is because the TELKOM exchange .dll does not know if the 087 in its look-ups.
Instead of 0876541201 use a number in the area 0215924033 to build the exchange.
Once the exchange is built and TNG is running you can select a default rate book.
We are using Neotel in this case.